Just fit the parts and that's it, no need to reprogram anything - it all just works.

Follow the install instructions as it helps with the order in which to do all the various bits, but the only issue really is the weight of it all and holding the rear bumper in place while trying to get the bolts in. Overall it's a pretty easy job.

Oh and don't forget the FREE 13 to 7 pin adapter. Yes really, it's FREE from your BMW dealer. In the end I fitted a 13 pin plug to my trailer, but they are 10 times the price of the 7 pin variety so stick with that if you don't mind a slight inconvenience with the adapter each time (it cannot be left in place).

Go for it.