When you don’t have the mechanical aptitude (I don’t), then you risk doing irreparable damage in the process of learning. I could junk the whole car just by a careless mistake. I can change oil, some bolt-on components, like starters and alternators, and can gap and change spark plugs, but that’s about it. When it comes to engine and body structure, I’m an accident waiting to happen.
In this regard, it’s a LOT cheaper just to find someone with years/decades of experience in this type of work.
OK, I understand, but get you a good trouble shooter, that is my best advice. Good luck!