torch the bushing till its nice and hot.
remove the center sleeve with vice-grips.
CAREFULLY hacksaw the casing. be sure not to cut into the subframe itself.
then use a flat head and a hammer to pound/pry out the bushing.
once the casing is cut, it will collapse and the bushing will pop right out.
it can be done in an hour or two, if you know what you're doing. BUT expect to spend about half an hour on the first one if you've never removed bushings before.
you can use a press, but you can easily deform the subframe.
BTW, did you buy some PSM solid sf risers? they are AWESOMETOWN.
you will feel your diff in your ass