The important thing is to approach it like any other game - the minute you think you have to - absolutely have to - make a ton or take six wickets, your game goes to pieces. Instead, think of it as a day playing cricket, do the same planning you always would, get warm before you bowl and make sure to have some throw downs. Go through your normal routine. You might get a score, you might not, but back yourself to do it sooner or later and be back where you want to be.
On which note - have you spoken to the ones skipper. Ask what he sees your role in the team as, and, if told that eh wants a seven bat to ride the bounadry, ask (respetfully) whether he would be happy to play in those circumstances...