Had to get the fan blower motor and resistor replaced again; hopefully this time it takes. They ran my car for 4 hours trying to figure out why it does what it does and nothing went wrong, so... Anyway, at least that particular visit was free (except now I'm out 4hrs worth of gas).
I really need to learn to do Car Things. I don't have great fine motor control (thanks tendons), but surely mucking about in cars can't be worse than correctly sewing a collar on a woven shirt. I don't really have tools and none of my friends are Car People, but none of my friends were Sewing People when I started, either.
I am privileged enough that I can pay people to do car things, but when I have a non-urgent matter it seems like I ought to see if it looks doable from YouTube. My car's 15 years old now, so it seems prudent.