I have a lot of experience with Jaguar, where even a change of brake pads requires the rear subframe to come out. For that reason, I think that any subframe work is best done by dropping it out of the car. It's really an easy job...support the body on solid stands, undo the driveshaft and parking brake cables. Remove the LCA bolts from the shocks and sway bar links. Remove the springs. You may have to remove the muffler. Place a jack under the differential and take the weight off the mounts. Then undo the four bolts that hold the frame to the body and drop it out. It sounds like a lot, and the first time through it may seem harder. But it's an hour and a half''s work to get it out, and after that, anything you need to do is easy, from replacing the center to replacing mounts to doing all the control arms. Otherwise, everything is an on-your-back struggle.