Doing electrolysis is hard. You are trying to hit a target you cannot see. If you want to do it yourself, you can reach some areas. Stay on the body and leave your face alone! You can scar yourself. It will hurt, too, so mentally prepare yourself for that. You can probably find a unit on ebay. I’m pretty sure a company that makes professional epilators and their distributers will not sell one to you without being certified. You can take a course somewhere, maybe doing some distance learning.
Just know, it is not easy to kill the almighty hair. Check out the DIY section here and read, read, read.