I'm somewhere in between being able to build an AR15 and a gunsmith, but leaning towards gunsmith. I've done my own Saiga conversion (which involved drilling, punching out pins, and a whole mess of work) and I do all maintenance on both mine and my father's firearms. That includes knocking out pins, replacing parts, etc. And I do it all with simple and antiquated tools often scavenged from my late grandfather's toolbox (ancient ball peen hammer, Miller's Falls 1/32 punches, my father's ancient Black and Decker corded drill, basic picks, and more). The one thing that prevents me from doing more is lack of a drill press. I'm not fearless. I know my limits. If I can't do it cleanly and without risk of permanently screwing something up, I won't do it.