It is important as a mentalist to notice small things about people... little things such as being able to tell if someone is right or left handed by looking at which way their belt is pointing. Looking at a book of matches will tell you if they are right or left handed by the side the matches are removed.... It's important to notice these things because the more you do, the more you will realize that each person has little psychological nuances that tell you a lot about the individual. Doing so will tremendously sharpen your skills.