Only thing I'm weary about is engine work, like valve checks or even opening the case, that's the end of the line for me in skill, which I still lack, just try to use common sense, manuals, and lots of forums/youtube.
I'm going to give you some advice, buy a motorcycle with a blown up engine for $500 and open it apart and then put it back together again. Repeat until it becomes easy like child's play. Do the same with fork seals and brake pads and the wheels. Then you will learn how to open an engine and put it back together. My friend did this with a Hyundai Pony he bought for $300. Fast forward 20 years and he is now a mechanic with his own car shop.