Once you have the studs out use the lower the jack a few inches. The rear diff and axles will lower allowing you to slide the bolts out of the mount and rear subframe.
Once you have the bolts removed slide the rear diff mount out of the subframe and take it to your workbench.
Now for the removal of the bushings. We also have a couple of alternate techniques so check below on those
Using your fairly strong buddy or a c-clamp secure the rear diff mount to your workbench. Tony's kind of a wimp so we used the c-clamp (He claims he is He-Man, Master of the Universe, but notice we still used the c-clamp).
Now, take your couple of screwdrivers and shove them between the stock bushing and the metal of the mount. The easiest place to do this is where the voids are in the bushing. Be sure to put the drivers between the bushing and the metal NOT through the voids.