Michael,
It's pretty easy on a late car. I did a writeup a few years ago on replacing a radio unit. Unfortunately the website upgrades means that my photos in the post have disappeared. However, to help you, I've just reposted the first few photos in order to help you see how to remove the unit. You'll find it easier to also carefully remove the aircon plug directly underneath the radio in the centre. (It will make sense when you look).
Have a look at the post here and let me know if you get any problems. In the meantime, I'll try and update a few more of the later photos.
viewtopic.php?f=40&t=8653&p=43491#p43491
Cheers
Paul