To start with, understanding the rules, commands and general flow of the program starts you on the right path. I have seen Lotsofnew people show up and don't have a clue.
Organization and preparation are key. Have a plan
Stay relaxed and focused on next stages - don't dwell on mistakes
Don't just wait your turn but observe what is going on and talk with those who just shot if possible.
Practice, practice, practice.
Practice some more