Just in case all the other posts did not warn you, not only are springs dangerous, you have to compress them to get them into and out of the pockets, there are also rubber pads that need to go in, and the last warning, when you disconnect the shocks the rear end will drop since it is limited by the shock travel. I hope you have the tools and jacks to support it and the car to push it back into place. I would rent a MB spring compressor, or wait untill you have saved to have it done.
I have seen one let loose, and luckily no one was in the way, There is a tool swap and rental section right on this forum. I would not do it alone just in case of emergency!