Of course, excessive nerves can get in the way of doing good work. So here are a few tips on how to keep control of your performance and prevent excessive nerves from creeping in. Use them and get your lines memorized as quickly as possible. Memorizing your lines early will free you from the burden of the physical script. It will allow you as much time as possible to explore the action, character relationships, sub-text, your character and all the other things you can't do well if your eyes are glued to a script in your hand.
Every character is crucial to the play.
You should know why your character is in the play. The reason your character is on the stage is the reason you are on the stage. If your character belongs up there, then you belong up there. You have a purpose for being up there. You belong up there.