I am 50, looking for a second career when I retire (which might be real soon if I continue to post on forums while at work, like I am now). While I do quite a bit of my own bike work and some for other people, I only have experience in things that I have done. My understanding is that there is no "certification" for bike mechanics, so most of them must be learning as they go along, or possibly got some training somewhere. How do most people get into this line of work? Are there schools, or do you simply learn as you go?