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.
'Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd
by the clean end.'