ive removed a few hundred in the last few years....some are easy and some are a ****in pain in the arse
what i found works on those PITA bushings are...take some round bar or stainless tube or something round that will poke threw the other side, angle it so it comes in contact with more bushing "meat" and start pounding, move the round around around and it different spots, or find the split in the bushing and pound that out, you might have to remove bits and peaces sometimes