It is a lot of work. My neighbor used to do it for a tire service and he had some pretty good sized tools to break the bead then persuade it over the rim edge. It can be done, but like Chris said, pay someone if you can. Good luck.
You don't appreciate a lot of stuff in school until you get older. Little things like being spanked every day by a middle-aged woman: Stuff you pay good money for in later life.