Steps:

Remember, there is no 'one size fits all' when it comes to body language. If you are really interested in being able to read a person's body language accurately, you may have to 'study' that person for some time. What is true for one person may not always be true for another. For example, when lying, some people break eye contact, while others ensure to maintain even more eye contact than usual so that they won't be suspected of lying.

There are lots of actions that most people perform when nervous. For example, someone might brush or trace a noticeable scar with their finger when nervous.

Watch their head position

• Overly tilted heads are either a potential sign of sympathy, or if a person smiles while tilting their head, they are being playful and maybe even flirting.

Tilted Heads

• Tilted heads mean that they are confused or challenging you, depending on their eye, eyebrow, and mouth gestures. 

Watch their head position

Tilted Heads

• Lowered heads indicate a reason to hide something.

• Take note if someone lowers their head. If it is when he is complimented, he may be shy, ashamed, timid, keeping distance from the other person, in disbelief, or thinking to himself or herself. 

Watch their head position

Lowered Heads

• If it is after an explanation, then he may be unsure if what he said was correct, or could be reflecting.

Watch their head position

Lowered Heads

Respect

Watch their head position

Lowered Heads

Look into their eyes

• People who look to the sides a lot are nervous, or distracted.

Look into their eyes

• If someone looks down at the floor a lot, they are probably shy,  guilt or timid.

•  Also people  tend to look down when they are upset, or trying to hide something emotional. People are often thinking and feeling unpleasant emotions when they are in the process of staring at the ground.

Look into their eyes

• Dilated pupils mean that the person is interested.

• If their eyes seem focused far away, that usually indicates that a person is in deep thought or not listening.

Look into their eyes

Disrespect.

Check their arms

• People with crossed arms are closing themselves to social influence.

• Uncomfortable with their appearance, or just trying to hide something on their shirt.

Crossed arms:

Check their arms

   Be aware of their surroundings.     If it's cold, or it might seem cold to them, they're probably just trying to stay warm.

Crossed arms:

If their arms are crossed while their feet are shoulder width or wider apart, this is a position of toughness or authority. 

Check their arms

• Crossing arms may also mean that a person is angry and trying not to show it.

Crossed arms:

• Though some people just cross their arms as a habit. 

• If they are rubbing their hands together or somehow touching their own body, they might be comforting themselves.

Check their arms

Check their arms

• If someone rests their arms behind their neck or head, they are open to what is being discussed or just laid back in general.

Check their arms

• If their hands are on their hips, they might be waiting, impatient or just tired.

Check their arms

• If their hands are closed or clenched, they may be irritated, angry, or nervous.

Be aware of nervous gestures

If someone brushes their hair back with their fingers:

• A common gesture if the person likes you.

• Their thoughts about something conflict with yours.

• If you see raised eyebrows, they disagree with you.

If the person wears glasses, and push them up onto their nose again, with a frown:

• Indicate they disagree with what you are saying.

Be aware of nervous gestures

Watch their feet

• A fast tapping or movement of the foot will most often mean that the person is impatient, excited, nervous, scared, or intimidated.

• If you are currently talking and they are tapping their feet, that is an indication of a desire to leave.

Watch their feet

• Note though that some people with ADHD will constantly jiggle their legs. It doesn't mean anything, it's entirely subconscious and, while eccentric, it is difficult to stop.

• Some people also do it out of habit.

Watch their feet

• If the person is sitting, feet crossed at the ankles means they're generally at ease.

• If while standing, a person seems to always keep their feet very close together, it probably means they are trying to be "proper" in some way.

• Sometimes feet together means that they are feeling more submissive or passive.

Watch their feet

If they purposely touch their feet to yours, they are flirting!

Some tips :

How To boost your confidence before an important meeting:

• Try holding your body in expansive “high power” poses (standing tall with shoulders pulled back, spreading your arms) raises testosterone hormone and lowers the levels of the stress hormone, this hormonal effect is actually reversed.

Some tips :

How To boost your confidence before an important meeting:

• Replace your smartphone with a newspaper.

• Now picture yourself in the reception area where you are waiting for that important meeting. And while you are waiting you are holding your smartphone... So tell me how professional is that? What about replacing it with a newspaper sounds good no? 

Some tips :

To spot a liar, look out for these four signals:

Hand touching, face touching, crossed arms, and leaning away.

Some tips :

To make a difficult task seem easier, smile.

• No matter the task, when you frown while doing it, you are sending your brain the message, “This is really difficult, I should stop”.  The brain then responds by sending stress chemicals into your bloodstream. And this creates a vicious circle: the more stressed you are, the more difficult the task becomes.

Conversely, when you smile, your brain gets the message, “It’s not so bad, I can do this!”

Some tips :

When you are in a place where you are presenting something like a project for a company and based on this project you’d be accepted or not hence you have to show the best of you.

So minimize your movements. Take a deep breath, bring your gestures down to waist level, and pause before making a key point. When you appear calm and contained, you look more powerful.

Some tips :

To “seal the deal,” make a positive last impression.

After you've settled on a price, signed the contract, or accepted the job offer, remember to make a winning exit: Stand tall, shake hands warmly, make eye contact, smile, say “thank you”, and leave your counterpart with the impression that you are someone he or she should look forward to dealing with in the future.

Some tips :

If you feel the need to improve your own body language, let your team know you’re doing it.

“I’m going through some training and I want to make positive changes in how I connect with others”. That way your team will be looking for changes and will most likely understand (and support) what you are trying to achieve.

Body Language Mistakes You May Be Making and How to Fix Them?

Rubbing hands

• Rubbing your hands together indicates nervousness. These may give your audience the impression that you’re uncomfortable and don’t believe what you’re saying.
  • Instead: Experts suggest keeping your arms to your side and in an open manner.

Body Language Mistakes You May Be Making and How to Fix Them

Crossing your arms

• This gives others the sense that you’re unimpressed or something is amiss. It’s a defensive position that can easily put a distance between you and your audience.
  • Instead: Be conscious of keeping your arms open and away from your body throughout like you’re about to give someone a bear hug. This open gesture is inviting, trusting and warm, giving a sense of peace and confidence for your audience.

Body Language Mistakes You May Be Making and How to Fix Them

Avoiding eye contact

• Constantly looking at the clock, at your feet, at the screen or anywhere else but at your audience will all make you appear unconfident and unprofessional.
  • Instead: Briefly establish eye contact to a comfortable degree with everyone when making a point. Keep it short.

Body Language Mistakes You May Be Making and How to Fix Them

Annoying movements

• Pacing back and forth, moving your arms and legs quickly are common distractions that will not fare well when trying to present and persuade your audience in a presentation.
  • Instead: Navigate the room with slow confidence. Avoid just staying in one place. Send a more positive message by slowly moving across the front or the entire crowd.

Body Language Mistakes You May Be Making and How to Fix Them

Fidgeting your legs

• Being farthest from your brain, the legs can naturally be the hardest to control while presenting. Fidgeting with your legs or constantly readjusting your standing position will give the audience the feeling that you’re uneasy and restless.
  • Instead: Stand confidently. Initiate calculated and controlled movements towards your audience so they think you’re a seasoned veteran who has already practiced these movements several times before.