I do this for a living, and if you don't I wouldn't recommend doing it.
It depends on if the tire has a tube or is tubeless, radial or bias ply, split rim or not.
Though the basic steps are simple, if you have the tools.
Release air, break bead, pry off tire with spoons/bars, lube rim/tire put the tire on with spoons/bars.
Don't do a bus tire though, no safety cage + no experience + high pressure = dead