It's also kind of dangerous though, there's a reason these people need to be certified. Dealing with a 5V breadboard? Yeah I'm game. Disassembling the housing of something to figure out which part needs to be greased or came loose? Yeah sure. My computer science training has prepared me to think outside the box and solve novel problems.

But if it's got 240V mains going through it, I'm not going to touch it. I like how my EKG currently looks and want it to stay that way. Why are humans made out of such a conductive material again? My CS degree didn't do anything to help me here beyond my biology class giving me an appreciation for how much meat-circuitry my body has that relies on fractions of a single volt to operate my vital organs.

A central AC compressor capacitor is plug and play.

https://www.ferguson.com/product/mars-usa-455-mfd-440370v-du...

Turn off circuit breaker, unscrew ~4 screws on the cover of the compressor unit, take a picture of how old one is connected, unplug it, connect new one matching up the symbols or letters, confirm with the picture you took, screw the cover back on, and switch the circuit breaker back on.

Watch any of the available 5,000 YouTube videos if unsure.

Well, the hard part is finding that capacitor. I try to repair almost everything and very rarely it is possible to find the damaged component without extremely specialized skills. The best you can hope for is that someone else has done the work for you and posted it in a forum. Even then it is often the power supply that goes first and those parts are dangerous to work with.