Quoted from ForceFlow:It will probably take you at least 3-4 years before you become competent in game repair, and probably a few more years after that before you become proficient enough to begin offering some simple repair services.
It's not going to happen overnight.
It took me many years when I had plenty of time and little money. Now that I have little time and more money, I have found that I don’t know sh$t anymore.