I personally wouldn't, if you don't usually wear them. I think it's really important to be yourself. Just present the best "you" there is. Get a nice mani-pedi and it will relax you, too.
Rush isn't like a prom, a one-day thing. I think that approaching it as a step will also put you in the right frame of mind. It's the first step of possibly a great journey. (yes I know that sounds lame)