What tips do you have for new magicians?

Evelyn Matlin has a great post up at Perfect Magic Then and Now titled "A Few Tips For New Magicians."  It covers a lot of good points that newcomers to magic should think about as they start performing for others.

My favourite from the post:

2.  Let’s say someone else or a magician comes to entertain you and you know the trick they are doing. What do you do and what do you say?
   
Correct Answer: Nothing. Not even to your best friend. Even after the show. If you have to tell someone, tell your mother.

Of course, I think that answer applies to a lot of situations that kids can get into.  Always tell your mother!

Do you have any other pointers or general magic etiquette guidelines to add?