Going to play the best team in our league tomorrow?

OK, so basically we have 2 games this week, one tomorrow, on Friday, against the best team in the league, and on Sunday, against the worst team in the league. Now, whats getting me nervous is that I'm the only rookie on my team, and the team we're going to face in the championship game next week is the best team in the league. It's only been 10 games, and 4 of their players have 20 points or more. I'm feeling very nervous because I'm the only rookie on my team. Is there any advice that I can get that helps me not feel pressured during the championship game?