Your knees can shake at the audition. They just have to carry you to the stage.

Nerves are not a sign that you are unprepared or unsuited. The body reacts to exposure whether or not you are ready, and waiting for the shaking to stop before you go is waiting for something that will not happen on schedule. What matters is whether the fear gets a vote or only a voice.

Let yourself be visibly nervous rather than spending energy hiding it. Walk out while your hands are still unsteady, start the first line, and notice how quickly the doing crowds out the dread.