I start by warming up for a couple hours by myself and then find the best players to practice with or make small bets.
Its all about where you are with your game. I only play once a week at this point but my game is the best its been my whole life. So it takes me awhile to fall into stroke but once im there im there.
Personally I think when it comes to tournament play you have to bring your A game the moment they call out your match. Sitting around for hours can really take away your focus.
So for me I try to remained focused on the game the whole time im there and not get too distracted. If you are at a big event with match times posted its easier to get yourself mentally ready for your match.
I think experience tournament play is the only way to becoming a better tournament player.