Sharpshooter

I've been told that martial arts are 80% mental,20% physical,what types of things can i do to get myself mentally fit,to one day be ready to join those who spar at tournaments

I am soon going to be sparring in my first tournament,what types of mental things should i be doing to help myself get ready for the contact sparring,

Hey,i'm from,Victoria ,BC in canada any one from around that area