You have a couple choices:
1) Drill a few larger holes in , and around, to remove the bonded rubber portion. This will relieve some of the stress. You can then use a hack saw to carefully cut through the bushing shell, which will then fall out.
2) You can burn out the rubber portion with a map gas torch, but take due caution with the smoke/fumes. Wear a scotch pack respirator. This allows you to either cut the shell or press it out as the stress has been removed.
I personally don't like to press bushings out as it can possibly distort or damage the part your rebuilding. Best of luck with it.
regards