There are a couple of post at least outlining the process. One about one month ago. Buy 2 boot kits on-line. Make sure they have grease and the lock washer in the kit! I paid $38 each including shipping and my mechanic charged $100 to fit them. We did brakes all round so it really saved doing part of the job twice even though the front pads had about 1/3 left of their black, messy, dusty, sticky, horrible pad material.
You'll need a 36 MM 12 point socket (if memory serves) and a lot of torque to remove and refit.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
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