The first step is to admit that you are nervous. You don't want to be too aggressive, and to attempt to approach a key putt with bravado is a mistake. Admit that the anxiety is present, you'll handle the anxiety better even if you can't make it go away. Spitalny warns against hurrying key shots because of nervousness. Gerring, though, thinks that there is no way to truly prepare emotionally and mentally for pressure situations.
All golfers are different.
Human beings are all different. However, there is no way to gauge what that player is going through, and it is all too easy and unfair to judge a golfer like Stadler in hindsight. Craig should feel good about how well he played. Spitalny and Gerring are in agreement about Stadler.