I'm not good at fixing much of anything (though I would love to be... just too nervous most of the time), but I got very good at de-jamming our main department printer years ago. Our admin Brian had named it Lola and would get very protective of Lola if anyone became too frustrated with it. Sadly, Lola tended to jam a lot, especially in humid weather. I became very familiar with all the possible jam points and de-jamming procedure and even replaced a spring that had popped out from somewhere once. I wasn't too fond of Lola at times, but our admin was a true gem, so it was worth taking the time to get to know Lola a little better and to be able to de-jam after hours so Brian didn't have to come in only to find that Lola had had the Office Space treatment.
On a side note, when I was about 10 my bff and I (same age) decided to earn some money and made flyers up, distributed throughout the neighborhood, offering to do any chore or make any repair, including fixing washing machines, ovens, or other major appliances. I'm pretty glad no one took us up on it. I'm not sure I was even very proficient with using my family's washing machine at the time.