i agree with buckfevr. just bump up a tree everyday or every other day and just stand in it. i would think you would eventually get accustomed to it. i used to have a fear of crashing my mtb when i would reach a rocky technical section. i used to portage those areas alot. after i got tired of all of the portaging, i started making myself ride hard through them. although, as i was doing it, i was scared as he||! but after a while, i actually looked forward to the rocky technical sections. now they are my favorite!!