I understand that, but if someone has no experience whatsoever he probably doesnt want to learn by tearing apart his bike and possibly messing up the timing or one of the other many things that can go wrong if you dont have a good idea of what you are doing. I tore my head off for the first time and installed a hotcam, no big deal. But when I went into the jug and put in a piston I did have to go back and redo it after getting the timing off and not properly tightening one of the valves. Of course the best way to learn is experience. Its a catch 22.