just buy the park tool book on bicycle repair, it covers most of what you will encounter. The expensive part is buying all the correct tools, not getting the knowledge, hell even trial and error isnt that expensive in the world of bikes.
In other words, just take the bike to the LBS
This is the biggest hurdle, by far. I'm self-taught, and above average in my ability to troubleshoot and repair, especially now that I have the tools. Only thing that still challenges me are compatibility issues (especially headsets and BBs, but I don't think I'm alone there). I'm also limited in my knowledge of SRAM as I am pretty much all Shimano (AXS and Tektro thrown in there).I would watch you tube- I like the Syd Fixes Bikes channel. Syd and Mackey are Racers that have 2 channels. Syd was all thumbs at first and the break down of repairs is pretty straight forward. The Park videos are great as well. I would then determine what you need and want to do on your own. I install brakes, cables etc…. I bleed brakes and trouble shoot shifting. I bring the bike to LBS to get suspension overhauled, wheels trued (and even taped) and hub/bb bearings overhauled. Watching you tubers explain how a rear deer actually works was enlightening and not very complicated. The biggest cost is the tools.
This is the biggest hurdle, by far. I'm self-taught, and above average in my ability to troubleshoot and repair, especially now that I have the tools. Only thing that still challenges me are compatibility issues (especially headsets and BBs, but I don't think I'm alone there). I'm also limited in my knowledge of SRAM as I am pretty much all Shimano (AXS and Tektro thrown in there).
Only big job I've yet to undertake is 200hr servicing, but I may send out for that. Oh, and new brake setups, but that's never been an issue because I never keep a bike around long enough to replace hoses. 😆
excepting any catastrophic damage (crash ect) im pretty sure brake hoses are a lifetime part (the lifetime of the frame that they run through)