2000 x5, 4.4 70k

What is the difficulty of doing a window regulator? Dealer want like $500, not from me if I can help it, will probably seek a indy shop if I have too. Any special tools required or any good advice besides the link on how to that is on this web sight. Things i have done in the past on my volvo are brakes, tune ups, and other minor stuff. Just not sure about the toughness of the bmw window regulator.

I am a newbie on the site and the wifes warrenty is out so I am trying to cut the cost of the dealer if i can do it.