It's pretty easy as long as you have the rivet tool. Make sure you get the rivets with the flares.

I just did it this weekend - see this post:

http://www.xoutpost.com/bmw-sav-foru...mers-back.html

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2012 F10 550xi Carbon black/oyster
2011 E92 M3 SSII/black
2012 W166 ML63 Steel grey/porcelain
2007 E93 monaco blue/beige (retired)
2010 E70 35d Space grey/saddle brown (retired)