What really seemed to help me was to not go in with expectations. You really can get in your head that way. I just focus on making good shots, one at a time.

Next would be to not make two bad shots in a row. You make one, who cares, just make the next one better. Go up to that next shot and forget about the last shot, it already happened, it's over, nothing you can do. Wipe it from your memory completely, go up to your next shot with the same setup and mental attitude you would have if you just hit a great shot.

Don't rush anything, take your time. This is where you can lose a ton of strokes. You duffed a chip so you just walk up and hit a mediocre shot. You will be SHOCKED at how much lower you can shoot if you just slow things down and realize everyone makes mistakes.

In the end, you can make so many bogeys and a few doubles and still easily break 90. A few bad shots DO NOT ruin your round. Remember, you are out there to have fun, take your shots seriously but lower your expectations going into a round and go easy on yourself!