I installed the unit myself. I have an 06 MINI, and used the radio interface option. It essentially just plugged into the audio harness, and other end into the head unit. It took me longer to take the glovebox and head unit out.
The DICE Silverline uses the CD changer protocol, so if you're pre-wired for a CD changer, you're golden. I got mine through European Autosource - with the fastest shipping option, there were no brokerage charges.
If you have a trunk interface, you may need this one:
http://www.europeanautosource.com/pr...oducts_id=1621
The only cable that needs to be ran is the iPod cable itself.
Give them a shout. Tom is really good about recommending the proper unit for your car.