The belt is actually very easy to replace...the hardest part is removing the fan and fan shroud. You need a 32mm wrench and a way to hold the fan blade from turning...there is a special tool that you could buy from BAVAUTO that hold the fan blade by the screws...I replaced the belt on a 330i and I just wedged a screwdriver in to hold it...that is why I am confindent to do the belt on the X myself...also pulling up the tensioners and locking them in place makes the belt install pretty smooth. My dealer wanted $185 to do the belts, I just bought the AC and drive belt for around $35 with my CCA discount.

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2010 BMW X5 ///M
Silverstone Metallic
Black/Black Merino with Black Piano Trim
Premium Sound
Driver Assistance
Comfort Access
High Gloss Roof Rails

Gone but not forgotten: Upgraded!
2003 BMW X5 3.0i
Titanium Silver
Navigation
Cold Weather Package
Premium Package
Heated Steering Wheel
20" wheels (275/45/R20 all around)
Supersprint Magnum Exhaust
AFE Cold Air Intake
Bimmian Chrome Guage Rings
What's A Resonator?