In about 2 years time span around 1990ish when I was in Jr High, I broke my 10 speed MTB frame twice and had it replaced under warranty. The first time my dad helped with the frame swap but the second time I was on my own. Ever since then I've been able to handle just about any bicycle maintenance/repair/build item that's come up. I'm surprised at how often I see adults who can't repair a flat.