Andy, I've also started to learn about engines and mechanical work with my first bike at age 47. It IS daunting!
I've discovered a few things over the last few months: you gotta have some decent tools ( I buy then as I need them), ya need a place to work ( i don't have a great place to work but it's something at least), and ya need to be patient.
It would also be great to have a bike to work on that isn't your daily ride so you can lay it up for a while, and also keep riding. I'm working on that one!
I've swapped the muffler, moved the turn signals, and re-jetted and cleaned the carb so far, but I haven't been game to get into the engine yet - the bike runs great, so I don't really need to. I need a project bike for that
It doesn't sound like much but it's leaps and bounds for me ... It's great to at least have learned what questions to ask
This site is a rare resource, the people here are experienced, enthusiastic, and generous.
I also have a couple of mechanic friends who are happy to help me if I get stuck - that makes a big difference.
But yeah ... patience