Avoid the screw-it style of thinking. This happens when you have a hole that you've hit a couple nasty shots. Then something happens. You shut down and say "screw it, it looks like I'll be taking an 8 on this hole", when in reality you're only on your 3rd or 4th shot. Think about it like a hole that you are salvaging. You might be on you're 5th shot from the bunker, but keep your focus and try to make a decent shot. I see people do this a lot when they're on the green. They say screw it, and don't even read putts. What success can you hope for when you're not planning your shots, taking practice swings or reading putts?