I guess I've done some of almost everything along the way from helper to master and EC, and also licensed for home and commercial improvement. A lot of it was self taught, a lot on-the-job, and a lot got figured out along the way. After all, how hard can (fill in the blank) be, right?
About four years ago, we built a 400-sq.ft. master bedroom/bathroom suite. I made and submitted the plans and drawings, and got the permits. The only work we subbed out were the little HVAC system and the brick/block foundation. We did the rest with our own hands.
I rented a backhoe and dug the foooting (which was a fun learning experience; I'd never run one before, but how hard could it be, right?), had a concrete truck dump the concrete which I leveled, then the mason built the foundation, leaving me a 2'h, 3'w crawlspace opening.
We stripped the siding from the house, did the framing (including a 25'-long triple-2x14" LVL ridge beam for the cathedral ceiling), sheathing, siding, roofing, gutters, exterior trim, plumbing, wiring

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, insulation, drywall, doors and windows, trim carpentry, bathroom fixtures, and painting.
I also built a 12'w, 8'h, 2'd custom storage cabinet with 9 pairs of doors (that match the shelves in the den) in the hallway between the existing house's den, where we replaced a window with a door, and the entrance into the bedroom. We didn't do the flooring, since that's what the guy did for a living.
At our final inspection, the inspector said that in his 25-or-so years of inspecting, this was the first time he'd ever had anyone ace (his word) a final on the first call. I guess we just paid attention to detail.
We have some pictures on our site, showing real before shots, pics that PJ made on her computer, and real after shots. If the Mod Squad has no objections, I'll post a link tomorrow afternoot for those who want to see them.
Guys?