I learned to be a carpenter back in the 70s by borrowing tools and walking onto job sites asking for a job. I got run off a couple jobs on my first day. I would barely make enough to go to the bar that evening. I finally got on a crew where I was sent to work on a remodel with an old carpenter. He also could tell right away that I didn’t know what I was doing. But on that first day we were framing partition walls in an old stone-walled cellar where nothing was square. We had to lay out two walls perpendicular to each other. He was trying to figure out how to do that accurately with nothing more than a framing square, when I suggested we just use a 3-4-5 triangle. He said “what’s that.” After I showed him, he said “I think you’re going to be alright; if the boss shows up just let me do the talking.” I learned so much from that guy.