You have to unbolt the diff and drop it then you can unbolt one subframe and replace the bushing, then do the other. Not super hard, but not easy either. You need to disconnect your rear brake calipers from the hubs (hang from sway bar with zip ties or wire) and disconnect the parking brake (PITA to get off and reattach) so you won't stress them as you drop the subframe.

You won't need a bottle jack to start the big bolt in the subframe bushing if you just raise the diff back up to level - that gives you the angle you need to easily start the bolt.

Actually removing and replacing the bushing is not the hard part - it's getting to the point where you can drop the subframe enough to get to it that is a bear (a lot of work). As the post earlier said you can use a small pry bar to go around and get it out and use a big c-clamp to press it in)

__________________
~shell
As of 2/2010:
2001 CLK55 0o\=*=/o0
13.6 @ 106mph
10K mi
1984 300SD
260K mi and going and going...
97 S600
46K miles
1991 Sentra SE-R (extremely dorked with)
www.se-r.net