Suggested reading: "The Inner Game of Tennis" by W. Timothy Gallwey. Even though the title implies this is about tennis, it's actually a book on the mental side of peak performance. Substitute the word trumpet instead of tennis and it would be just as appropriate. This book deals with aspects of you being two people, the ego side, and the one who actually does the performance. There are many illustrations on how your ego will interfere with performance and simple tactics on how to deal with this issue. It's a great book and it applies to most all facets of life, and offers excellent techniques on how to deal with many issues that we trumpet players struggle with on a daily basis. Read just a few pages and I'm sure you'll agree with my opinion!