I have found, both in my life as a creative and in my career in casting that there are two kinds of people: those who love auditioning and those that would rather eat glass, but know they must audition in order to work. Either way, auditioning is a necessary evil, if you want to be a professional actor. There is just no way around it. If you are a person who loves auditioning, consider yourself blessed.
If you are not one of those people, every little thing about the audition process probably becomes something that you question or second-guess. What you wear, when you arrive, what you prepare, and even the simplest moments like interacting with the monitor become things that you obsess about the night before — and maybe even sometimes stop you from going to your audition. These fears become your excuses.
First, I just want to say that these fears are totally valid. How you deal with the process of putting yourself out there is your own business, and each individual relationship with the audition process from breezy to terrified is totally legitimate.