Basic anatomy. That has got to be the ongoing frustration: Why can't my fingers do what I want them to do? Not being able to play what I hear in my head - that is the ultimate source of frustration.
Joe SatrianiWhen you're a guitar teacher, you teach people for a few years, and you become comrades after a while. Because everybody eventually catches up to everybody else, and you want to help each other out - to see if you can make the dream a reality.
Joe Satriani