I have a friend that suffered a severe spinal injury about 50 years ago. He is confined to a wheelchair and has about 20% use of his hands. For many years he worked as a bicycle mechanic and has been a car guy all his life. He's now retired and spends his time working on his 39 Pontiac street rod. If he can reach it, he works on it. Life dealt him a bum deal and he's still lived his life his way. The guy's my hero.
BTW, I've been a parts guy for years. If you can, after you've been in the business a while, get into a dealership. That's where the money is.