Easy peasy, took me 30 mins.
Put it in the boot, screw, or as I have velcro it down!! Doesnt skip. Right run the wire down from the boot, past the rear seat, under the plastic trim on the back 3/4 panel and underneath the seatbelt. Then poke the wire through behind the seatbelt trim.
Take off the passenger side rubber door seal, and run the wire down the seal, replacing the trim.
Pass the wire behind (or to the left) of the bonnet release catch, then pass it up behind the stereo, cable tying the excess to someting solid or the wiring loom up behind the glovebox, youll feel it!
Get some radio keys, pull the stereo out and plug the unit in, its obvious where it goes. Push the radio back and thats it.