well, everyone has there own way of dealing with nerves....that is an individual obstacle only you can figure out...for me personally i looked at myself in the mirror and calle myself a p#ssy countless times b/c when you think about it there;s really nothing to get nervous about...your not getting sent off to war...your not jumping pff a cliff...etc etc....i made myself have fun!!! of course it didn't always work....and sometimes the nerves made me play better. it's just something you need to deal with.
my advice nutrition wise would be to eat a ton of pasta the night before or some oatmeal....or maybe even a shake with 1 cup or 1 cups of oats. you need energy to compete gg!!