DS6 had a slight issue with this as well. He would crumple up paper left and right if he couldn't get it right. For us, we decided to tackle the perfectionism in him by putting him in situations where he wouldn't be right or the best (baseball). And we've shown him examples, especially with the latter, of people who didn't get it right every time. This helped him tremendously. We also, when correcting each other, emphasize how even Mom & Dad are wrong sometimes. It has helped tremendously, though we still have nervous breakdowns from time to time. Good Luck!
