One tool you can use in your game is Pacing. If you go all out with every shot on a long night, you might tire and fizzle out just when it matters most. Nurture your concentration by letting your mind rest once in a while. Just assure yourself that you know when you are relaxing so that you will not get real emotional after missing shots and get affected all the way through; and so that you can react to a wake-up call on critical shots. Be aware of that switch which you will turn on and off. A good time to relax is when the table is tight. You can set the game up by letting your adversary take the hard shots. You can also relax taking an easy shot, especially when the remaining balls are flirting with the pockets. It is also a good time to do whatever psy-war you want to work on while relaxing. If you lose your game because of a relaxed shot missed, don't take it too hard. Part of the game. You can't always win. At least it's better than missing an intense shot. Besides, you can always try harder next game. Remember - relaxed or intense, you must always plan at least three shots ahead and decide on what kind of shot to execute before getting down to make your bridge. If you have second thoughts, get up again.
The real good thing about pacing yourself is that you can enjoy your game better, win or lose. Isn't that what matters?
