I haven't changed much in my game over the last couple seasons, and just stuck to being Jim Kenesky on the golf course. I don't over analyze or worry about my last shot, I just remain relaxed and believe in my ability. To many times golfers tell themselves how bad they are, and it's amazing how low their confidence is. I was once told I was the best putter in Southern Ontario, I started to believe that. Though there's no proof I am, but in my mind I walk around thinking that. That's why some day's I make more putts than others, because I believe I can get it in the hole as good as anyone.
The bottom line is... find a great mix of what makes you comfortable, believe in yourself, and confidence will make you never worry about that one shot that went astray.