Man, that's brutal. In my experience, you gotta have a backup supplier lined up for anything critical. It saved us more than once when a primary source fell through.

Listen to your buddy felix824, he gets it.

Tell me about it, I got burned ordering salad.

Exactly. Reminds me of my buddy who rebuilt his entire engine using YouTube videos and forum posts. Mechanics told him it was impossible without their tools, but he just used a cheap socket set and stubbornness. @jennyh41 is right about the self taught thing too. That guy never finished high school but now he fixes cars better than most shops. People get too hung up on the official path when half the time the real solution is just figuring it out as you go.

sean_johnson16 is totally right about the straight cuts, but a speed square is also a secret weapon for marking rafters. You can lay it right on the board and mark your birdsmouth without needing a separate framing square. It locks onto the edge and gives you a perfect plumb line every single time. Saves a ton of fussing around when you're up on the ladder trying to hold a big square steady. That little triangle does way more work than people give it credit for.