There's a member here on this forum - TRIPL_O - who did both mine and my wife's X5s remotely just a week ago. Exceptionally professional, simple and smooth process over the phone and internet. Even sent me a loaner cable. Though I decided to purchase one my self so I would always have it handy if some new coding was needed.
I'm am relatively geeky my self, but my time is far too valuable than to start learning the coding from scratch and in the process possibly jeopardize our brand new 2012 and 2013 X5s.
The cost is far more than reasonable and in hindsight I wouldn't have done it any other way.
If you've got any questions just hit me up and I'll try to answer.
Cheers!
H