make sure when you try the first one out, you have something to record video of it so that the rest of us know what NOT to do. just rent a compressor. its cheaper than a hosiptal bill or funeral arrangements.
i know that at lots of auto stores they sell spring compressor tools that attach to either side of the spring and hand clamp down. lots cheaper than the RIGHT tool, but tricky and somewhat dangerous!
whatever you do, don't pull the nut off that shock until the spring is damn near loose!