I do everything but transmission work unless its just a minor leak, Like replacing the transfer case gasket or the governer leaks. Transmissions can be tricky better take it to pro shop. Also the guy who talked about timing chains, yea that sucks donkey dick.
Working on cars is simple for the most part.
There is some work that u just cant do though without heavy equipment. Like if a wheel bearing goes out you need a press to take it out and put the new one in.
Changing tires, gl without a wheel machine and tire balancer.
Brakes are really simple too, although drum brakes can be a pain. Why pay 4 hours of labor for something I can do in 30 minutes especially if its just pads.
1.Jack up car
2.Remove wheel with impact gun lugs are usually 19 or 21mm
3.remove the 2 caliper bolts
4.insert new pads, they only go one way
5. reinstall
If your rotor is pitted theres a chance u can grind it smooth and not have to buy a new one. This would be the only time i'd consider taking my rotors into a shop and paying them to grind em smooth but hell new rotors are cheaper then the labor they charge you.