Have you ever learned anything in your life? Or you just came out of the womb omniscient? No need to answer, it's a rhetorical question.
So, other than rebuilding driveshafts... what have you ever done?
Design and build a suspension system?
Ever weld up an all-aluminum Water-to-Air intercooler system, including a swirl pot?
How about a turbo exhaust manifold, from scratch?
Ever install a stand alone engine management system, and tune a 130hp economy car engine to make 240hp, reliably on track, without touching the internals?
Yeah, I'm new to trucks. But I bring knowlege from other experiences. So I've never rebuilt a driveshaft before, bit ************* deal. I learn fast once I set about to do something. All of these things were my first attempt, and very successful.
What have you ever done, other than wag your barbed tongue?