Re: taking off floyd rose and putting back on
Pop the springs in back, and with a little luck, it should lift right out (depending on your route and the height your posts are adjusted to).
When I was testing pickups in the guitar in my avatar, I had a spare pickguard that I would swap in and out. I simply popped the springs in back, lifted out the Floyd (kept the strings locked at the nut and the bridge). Then all I had to do was put in the new pickguard (that guitar has quick connects for the ground and hot), tighten down 2 screws to keep the pickguard in place, replace the Floyd, and reinstall the springs.
If your Floyd doesn't lift right out after popping the springs, I would suggest measuring the height of the posts (and writing these measurements down somewhere) before loosening them. If you use those measurements when reinstalling the Floyd, your bridge height should be in the ballpark.
Getting the springs back on can be a pain. I suggest using a pair of needle nose pliers to hook them back over the spring claw.