My son, who is 6yrs old, has been doing karate for about a yeay now and is going for his orange belt. His sensei keeps asking when I'm going to join and I've finally decided to start, at the age of 40. As I am quite self conscious and would hate to look like an idiot, would it be a good idea to try and learn some of the basics and Heian Shodan before attending my first class, or should I just take the plunge ?