Just practice poker face and limit your movements or make a lot of movements so they can't find the pattern on your moves. I think that those are the only things that matter in a game of poker, make a really flamboyant one so they think that you are cocky or be tacit and have them question your next move.
Do this, without becoming theatrical. If not, it will give you the clear idea that you are playing a meaningless and logical game, and that way it will be easier for opponents to be able to understand what you are trying to do.