I'm "just a tech," and I love fixing stuff around the house. I used to work on my own car, before they effectively banned doing so. In today's scenario, I would have done as rstoddart suggested. "I stink at it, will you help me learn?"
As "just a tech," I was kind of astonished to find that I was able to pass for an engineer; I realized that they're just frat boys with an obscenely expensive piece of sheepskin.
True story: My late dad was a mechanical engineer (academic). During my youth, toilet handles were left unfixed, a blue 1970 VW bus (no radio/black vinyl seats) gathered rust and dust in the driveway for years until one of his more mechanically inclined colleagues bought it for $100, got into the rear-situated engine with a wrench or two, and drove it away one day. I hear it's still sputtering around town after about, say, 30 years.