The electrical is relatively easy. It's not much harder than replacing a frayed power cord on a lamp (with an extra wire if the unit is 220 rather than 110).

Managing the lineset is the scary part (though it's not that hard). You're vacuuming copper lines that you've hopefully sealed correctly. If you get that wrong and your refrigerant yeets off into the sky, you have to call in help because it's hard for an unlicensed person to get the refrigerant legally. That half-hour of work and ~$1 of materials will cost you a punitive amount of money.

It should be super-easy these days to get the license.

Ten years ago, I downloaded a free study guide and took the test in-person at an A/C supply shop for about $50.

Today, you can take the test online.

Thanks to ripping off by HVAC contractors, many are signing up for EPA 608 certification to get the refrigerant legally.

It’s really easy, 220v is not that hard to install and is the scam scam run by people installing ev chargers.

You do have to go through the permitting process which means having someone come out to view it and write off on it and if you state it properly it should be less than $200.

Electrical is both surprisingly easy and surprisingly hard.

The actual work involved is relatively easy and straightforward. However, the code and regulations are extremely difficult to navigate. There’s a lot of non-obvious things you have to do to be code-compliant.

Some understanding of electrical circuits, split phase motors, and control circuits (using step down transformers, relays, contactors) is extremely helpful. HVAC systems contains at least two motors--blower motor inside and compressor motor outside. And control circuits are activated by a thermostat.