I think the 1st response was the best one. Assuming you're talking a full-line gunsmith. I have noticed that around here, most people who call themselves "gunsmiths" aren't. I honestly don't know where I would take my gun for some of the more critical repairs or upgrades.
For instance, threading a barrel sounds easy. It was recently brought to my attention that if you don't make the threads concentric TO THE BORE, forget it. easy to make threads, hard to do it correctly.