Yep, things like that happen, maybe not all the time, but i know well the feeling of having just shot myself through the foot. It doen't feel good. It makes you think how you might have done it differently, that's for sure. I can't remember anything specific at the moment, but I've had more that my fair share, especially being a guy that couldn't afford to buy the great gear I may have wanted, and had to build it myself.
You can imaging the type of disasters that can happen when you're trying to do something you have no experience doing. It can get out of hand.
Regards,
Dan