Q: i have an audition for my school band tomorrow. convince me not to be nervous
A: you can't deal with nervousness outside of the situation where the nervousness occurs. and to deal with it takes probably a slightly longer amount of time than your audition. this may not seem helpful, but let's say you have 10 auditions. by the 6th one your nervousness will probably be mostly gone. so in that case, it might be a good idea to go for a series of auditions that you don't really want, as practice before going to the one that matters