Body Language

Today my friend Kelly, did a presentation on wanting to be a phscyatrist when shes older. I learned that they get paid like 77$ an HOUR! :O And i really like the sound of that! So, I was thinking about how she said that she would be good at that because she can read peoples body language very well, so I'm gonna start doing some research on reading peoples body language!! I dont know where to start, but I think it would be kinda cool to like, be talking to someone, and if they fiddle with like, something on their pants then they feel nervous or something! That would be sooo cool!!!