When you remove the rear bumper make sure you have a some type of blanket or cushioning on the floor to rest it on.

There will be some amount of sand/rocks that will come out from inside the bumper and a potential to scratch it. I learned the hardway but having 2 people there is a good idea for that part of the install. It took me about 6 1/2 hours to do it and I used a combo of instructions I found on this website and the BMW included ones.

Oh, also, get a torque wrench to use for the bolts that are installed into the rear frame.

And I echo the comment about buying the BMW hitch. Once I saw how it installs and compared it to an aftermarket one I saw the reason I paid more.l