[lan321]

Don't worry, would be my main advice. Find an official service manual online and follow it. Avoid following YouTube advice without checking the manual as well. Many people on there are not the smartest and will make things difficult for themselves or dangerous for no reason. (I only like M539 Restorations and The Workshop nowadays)

Aside from that, get a clunker or, even better, a motorcycle to work on (if they float your boat, of course). Motorcycles are wonderful because everything is easy to reach, light and usually kinda sexy for the year and price.

Again, don't worry too much. You can rebuild an engine if you have the tools and follow the manual. It's all just following steps. Just don't get clever if you're lacking a tool or something. Take a break, get what you need, don't start doing "clever" things because you feel like it's life and death to finish something right this moment, and you'll be good.

Edit: Oh yeah, and a welding course is probably a good idea down the road. I keep delaying it, but it'd be useful, and it'll also surely be kind of fun.