The low-buck but messy way to R&R the bushings is to burn out the rubber with a propane torch then collapse the metal housing with a punch and sledge hammer. The new bushings simply get hammered in with an appropriately-sized socket or piece of pipe. I've done dozens of bushings this way. Do your rubber burning outdoors, however. The black smoke and gooey mess will stink up your garage for weeks (DON'T ask me how I know this...
).