If you feel fear move through it. Express it, feel it, allow it. Interestingly, the oldest meaning of the word fear signifies to pass through, so if you follow the meaning, you will understand that is part of your growth process to move through the fear instead of withdrawing at the very point at which the fear manifests itself. When you move through the fear, you will experience a release of blocked energy, followed by enhanced pleasure. Then you will realize that fear is a good teacher.
I don’t mean by this approach that you have disregard your limits however if you come to a place where you feel that the challenge is too great, trust yourself and break off the thing that you doing gracefully.