It doesn't matter stressed at beginning. The cards can relieve stress. This helps do a ritual to any chosen hole cards. A ritual like a smoke, prayer, or a drum beat. It shows your paying attention and with a random shuffle the Poker Gods telling you when to do it. So you avoid collisions.
If your tired its best to get a cat nap before playing or you wo'nt finish the tourny.
It is a good idea to fluxuate your tourny buy ins. You want to win the big money tournies and lose the freerolls
and the tournies that do'nt pay well. The one that matters, (you) knows it just won tourny and really the competition equal. You prolly wo'nt win right away. Win the big ones. lose in the small ones. Play the same or your going to screw up your count.