Everyone will have a different story. As a kid I never stopped making things or taking things apart. In my early twenties I started to play guitar, soon I decided I'd make one: it was a classical guitar. I found a book 'The classical guitar' by McLeod and Welford-its still available. I heard of a couple of guys making acoustic guitars, visited them and bought some mahogany and spruce for the soundbox. Over the next couple of years I made 5 guitars. It took me 120 hrs each instrument and I was frustrated by my lack of musical ability, so making fizzled out.
Fast forward almost 40 years. I was trekking in NZ and met a guy with a uke. Later I decided to buy one. I found it was easy to play compared with a guitar. If I can make a guitar, I can make a uke went my thoughts.
So I made a mould, made a tenor and 10 months on I've made 6 more tenors, 2 sopranos, 2 small guitars and a few repairs-all for the fun of it. Its addictive.
How to get started? Its so easy these days-youtube is packed with info on tools, techniques, jigs etc etc, there are many more books available and this forum helps enormously. We all start at different points in terms of experience/skill with hand tools: you dont need many power tools as a beginner. Give it a go, start simple.