You can make a puller fairly inexpensively with some iron/galvenized steel pipe fittings, grade 8 bolts, nuts and serious washers or a metal piece like a WADA. The pipe fitting should like a ~3" to ~1" adapter. The larger end has to be big enough so the bushing will slide into it. Take the new bushing with you to the hardware store you buy the right stuff. Place the adapter on the outside of bushing, put the screw with your washers at both ends and tighten the bolt. After a few choice words the bushing will be out. Installation is the reverse. With the right stuff you can have the bushings in/out in < 2 hours.