I'm looking at getting a Parrot CK3100, just wanted to know how easy this is to fit DIY?

I've got an Audi Avant (B6) with Audi Chorus hu, are any additional leads required to install or do I need to chop / splice any of the standard leads?

Have seen the pics in this ebay ad - sort of put me trying it myself but I've read elsewhere it's not too difficult.

http://cgi.ebay.co.uk/Parrot-CK3100-...QQcmdZViewItem

Any advice / experience appreciated.