You mostly don't. Household plumbing and wiring is nowhere the near of complexity of, say, a lawnmower engine. It's mostly "the p-trap is leaking", "the faucet is leaking", "the toilet's flush valve is broken", "the wiring nut is loose". The kind of stuff you don't need skill to fix properly.

There are situations where you do want to call a pro, but it's not what you usually call them for. Most of it is one notch above "my trash can is full, can you come over and empty it".

Besides, your argument applies to the AI case too. You're not paying for AI output. You're paying for my expertise in prompting and my ability to evaluate the output and say "yep, that's right".