Built a swing set without the instructions (don't recommend)
So apparently there was a reason the instructions came with like 50 pages. Thought I could eyeball it and save some time lol. Got about halfway through before realizing I'd installed part of the A-frame backwards. Took it all apart, started over, finally got it up. The kids think it's amazing but my wife won't let me live this down. Anyway the whole thing took like 6 hours instead of the promised 3. Lesson learned: just follow the dang instructions.
50 pages seems excessive but honestly those engineers probably accounted for every scenario you could mess up in. Sounds like you found a few of them haha.