Please don't be so hard on yourself. You made the effort. You have the battle scars. As long as you improved a few skills along the way, you accomplished (or will accomplish after you heal) what you set out to do!
I built my coop from scratch, with no plans, only a vision. I probably should have had my eyes checked before I started. Although the coop turned out OK, there were more than a few times I had to ask myself what I was thinking! The run looks pretty shabby, but it's secure. As others have posted, the chickens don't really care.
The best part of all though - - getting that FIRST EGG! That's what makes it ALL worthwhile.
Bob
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5 RIRs, 3 White Leghorns, 1 very mean Lavender Guinea