I have done my own work.

I'll do whatever I can and feel comfortable with - the big limiting factor is lack of tooling and space for a full-blown shop. And also, I'll only take on new or difficult work on my own guns - I'm not to a point where I feel comfortable doing all but the most basic smithing on someone elses pride and joy.

I just do the light stuff on my own guns. If I don't have the right tools I don't fool with it.

I qualify for most when it comes to the AR15 platform.

Actually, my answers should all be in the past tense.
I have my competition Springfield, with which I quite successfully shot practical exercises at least once a month for many years, in pieces, in a case in my basement workshop, waiting for me to complete it. I haven't gotten to it in the past 10 years!
That's because where I now live there is no place to shoot it. No incentive, you see.

All but the last 4.