^ you definitely need the rivet tool unless you want to struggle with pulling the old rivets out with pliers and a screwdriver that didn't work too well for us. Yes, 2 of us and we still had a hard time. The rivet tool was about $25 online if I recall correctly and you could definitely do it yourself with one. In hindsight, I would pay $50 to have someone do it if I had someone willing. It takes 30-60 minutes depending on experience.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr