If you want to know just how important it is to not think about score:
Let's say you're a 12 handicap.
Put 12 pennies in your pants pocket. Every time you make a bogey, take a penny out of your pocket and throw it away. If you make a double, take out two pennies. A triple, three pennies. You get the idea.
Then, see how many pennies you have left in your pocket by the end of the round.