My first and only guitar with a floating tremolo is my Ibanez S470BK. Changing strings on it the first time was quite 
intimidating, but it was really quite easy. Every string change I keep on coming back to this forum thread on Jemsite.com which is the best howto for ZR bridges:
http://www.jemsite.com/forums/f21/zr-tremolo-setup-guide-picstory-tons-of-pics-zrtremolo-48897.html
If I would add just one thing to the tips it’s to wrap some adhesive tape around the battery, so that it won’t risk chipping the paint in the cavity or on the trem itself. And yeah, not crazy about keeping the knobs on the strings and putting them in the tuner end myself :-)
