Re: Pick one thing........
As a wiring/radio geek it would probably eventually be the electrical system or electronics.
But since I'm not a cabinetmaker, I usually have gaps of 1/64", 1/32" or more where materials are supposed to meet, which always leaves ugly dark gaps. If I could get all the cuts to fit perfectly, I think I would be more proud of that.
I still remember that, as a kid in elementary school, I was embarrassed by my mother boasting of an "A" I got in a subject that came naturally to me. I was much more proud of an average grade I earned in a subject I struggled with.
Someone said "Making good decisions comes from experience, experience comes from bad decisions." I say there are three kinds of people: those who learn from their mistakes, those who learn from the mistakes of others, and those who never learn.