Spent today fitting mine, its an absolute bitch of a job. I think it took the 3 of us about 3hours, the majority of which was getting the bumper on & off.
Also if your car is lowered it will be soooo much easier if you take the rear wheels off to get at the bolts by the wheels, with the wheels in place its really hard to get a socket in there to undo/tighten them.
I used this guide http://www.350z-uk.com/forum/viewtopic.php?t=13807 and went the route of removing the rear bumper completley.
Ill get some better pics with it lit up tomorrow, the one above has the hazards flashing aswell