I replaced the lenses on my 07 X5 and echo the previous comments.
I found that a cheap heat gun did assist in softening up the adhesive in the channel holding the lens. Didn't need to get it to hot to touch, just warmed it up a bit.
I also ground down a flathead screwdriver to fit the channel to help me get under the adhesive without tearing up the light.
Take the time to blow out all the tiny pieces of plastic before you put the new lens on. The stuff hids out in all the crevices in the light.
Wish I would have changed out the halos while I had it a part.
With the driver side fendor liner out, don't drive the car without zip tying the wiring harness above the wheel. It droops down and rubs the wheel once you get going.

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