1. Choosing a Monologue
I'm just zeroing in on nerve-busting strategies here. Obviously you must still take into account all the normal stuff like appropriateness of genre, range, length, context, your personal connection to the piece etc etc.
If you've done any work with me you'll have heard me say that you need to know your text inside out and back to front. This is always true but it is especially important in the context of an audition. To test if you know your piece well enough try it while doing something that requires both your body and brain like a choreographed dance or gardening. If you cannot simultaneously say your words and do the activity then you don't know the piece well enough yet. In addition to knowing your words inside out, it is also helpful to know yourself. Everyone is different. How do your nerves manifest? At an audition what does your body typically do? What mannerisms and personality traits surface? And how can you use this knowledge to your advantage?
Now, I'm NOT saying that you should choose something about a nervous actor and just ride your nerves in the audition. There are so many reasons why that doesn't work. But it IS a lot easier to match your physical energy and subtly change it than is is to do a complete 180 against what your body is giving you. You'll always have to ground your energy, personalize and get into character but if your nervous self is highly strung perhaps a neurotic or desperate person would be a better choice than a depressive or zen-master. That way you can use your adrenaline engine instead of spending all your energy trying to smother it. Similarly, if you become paralyzed with nerves and want to crawl into a hole a hide then perhaps you want a less physical character, look for something a bit more contained.
The hardest part about auditioning, especially if you are choosing to work with your nerves instead of against them, is staying/getting grounded. Most of us when we're nervous let that hysterical energy bring our centre of gravity way up into our shoulders. But we'll address that a little later in the series. Right now just think about the character you've chosen or are going to choose and how you can make the physical manifestation of your nerves work for you.