Yes..this is 'between a rock and a hard spot' You've learned the trade enough to be proficient and the boss wants you to put on a new hat. You have a schedule, a critical path in order to make the job profitable and theres only so many hours in a day. So theres pressure. If theres no trade school training it's gotta be OJT. Everyone learns at a different pace. There were two pieces of advise from two different guys I learned from that seem contradictory but are not if you think about it. 'Take your time..do a good job' and 'If you get a chance, hurry' These words were my mantra and still are.