You might win or you might lose but if you're set to lose, make them work for it. Instead of losing 9-2, try to stay focused and lose 9-4 instead.
People say don't miss but that's not a good idea because you'd be asking yourself to execute to perfection and expecting perfection only results in disappointment so instead go with a different mindset: allow yourself to miss and cut yourself some slack and try to be able to recognize when you're not commited to the shot and reset yourself if that happens. Your goal is to be able to bring 80% of your best game 8 times out of 10...not to play perfect pool.
That's a reasonable ask of oneself.