I have competed in both Powerlifting and Weightlifting. Depending on which I take one of the following approaches:
1. Powerlifting, I like to get revved up, rage is your friend :-) On a tie breaking third attempt I get a buddy to slap me hard on the back - gets me pissed off! I perform better in Powerlifting this way.
2. Weightlifting is a different story, getting all revved up does not apply! My mind must be clear, trust our preparation, be confident you can do it and allow it to happen.