This is one of the weirder tips you will find on this site. It was given to me by an old teaching pro. I have tried it and produced some good shots but the jury is still out on this one.
“At the top of your swing pause for a fraction of a second and smile in anticipation of the beautiful shot you are about to produce. This will relax you and take the negative thoughts out of your mind. Go on, try it you will see.”
I think the message here is that if you think you are going to make a good shot your chances of doing so are greatly increased. Anything that is done with confidence is likelier to have a better outcome than something that is done with doubt or apprehension.
Imagine the outcome of everything you do with confidence. This applies to life as well as golf.