It's amazing what you can learn in old library books.
I built a gas powered motorcycle, a gas powered go kart and a battery powered golf cart, 100% from scratch parts I bought at Goodwill, Amazon and Craigslist.
I've taught myself welding, car repair, computer programming and playing piano the same way.
Just from library books.
I actually make my living from the mechanical and electronic knowledge I learned from these books.
I repair slot machines, arcade machines, pinball machines and people pay top dollar to have me restore the old retro games back to their old glory.