I ran across this website by horn professor/performer Jeff Nelson. Mr. Nelson was a member of the Canadian Brass, and is currently on the faculty at Indiana University Jacobs School of Music. He has some very interesting concepts on overcoming fear in performance situations. Explore his excellent website, and enjoy.
He links great performance to striving to concentrate on what you want, instead of what you don’t want. How many times as instructors and judges do we dwell on errors, instead of asking the students and instructors for the desired behavior or skill?
He also makes the correlation between great performance and magic.