"Nothing is worse than having to give up and have your car towed to a repair shop half assembled and have the mechanic sort out your failed DIY project."

Probably worse is picking up your rebuilt engine that is half assembled by some tractor mechanic, and they broke a cam follower and painted the cam! (because your dad paid for it and knows best) then having a big oil leak in the frt crank seal, then giving up on your project ('68 TR250) and leaving it at a friend's house for, oh, 15? years. Sob. It goes to the point. You may not know what you're getting into, and the shop may not either. Be informed.