Ha! You'll still be screwing bows up after many years of building them bro.... You get in the groove and just make one wrong move without giving it a thought. My favorite boo boo was flipping the whole stack putting it into the form.
Now if i did it on the first limb, i could sometimes just flip the other one over too and save the lay up....But Noooooo... its typically on the second limb i pull something like that.
Just the other day i was doing tip overlays. I have a system i use where i laminate the overlays wrapped in plastic and clamp them to the limb tips slightly curved shape. Then i take them out and pre shape the transition to the glass to a razor sharp edge before gluing them on the limb.....
Somehow i was in auto pilot or something, and flipped the overlay end for end and glued it to the tip without noticing it. (I had a lot of other irons in the fire that day) So there i am shaking my head thinking how on earth am i going to sand this transition to the glass and make it look the same once its glued to the limb?....... Simple.... I'm not.... So i ground off the tip overlay and started from scratch.
Moral of story.... There is a boo boo or an oooops waiting to happen at any time regardless of how long you've been doing this. I could list dozens of things that are easily screwed up too, but you'll figure those out yourself. But sometimes..... an ooops can become a revelation that makes you rethink things. Kirk