No more than minimal competence as shade tree mechanic who used to be able to tune car and have done some bolt on, bolt off repairs such as water pumps, alternaters, shocks, et. al.
Decided to junk a Pontiac Montana after the head gasket blew (endemic problem for that engine) and my mechanic listed all the things that could have happened to the engine to make it cost more than my budget would allow. Somebody suggested taking the alternater, starter, and catalytic converter off and selling them separately.
I couldn’t get the first bolt off the alternater. I didn’t have room between the radiator to put a breaker bar on, didn’t have leverage to use a combination wrench. The only thing that I could get on was a flex head ratcheting combination wrench and still didn’t have the leverage needed. I could put a box end wrench on it, but didn’t have room to rotate a cheater bar. How could I get the bolts loose? Similar issues with spark plugs. How do I get to plugs on back side of engine?