Head Unit Removal.

Disconnect battery - make sure you have radio codes at hand + information on any other hardware items (boost controllers, turbo timers etc).
Remove the Centre Console
There are 3 Phillips Screws to be removed from the lower part of the head unit / front compartment, and then the 2 Screws at the top holding the cradle in.

Disconnect plugs for speaker looms & arial.

The head unit is screwed into the cradle with 4 screws, remove these and the head unit will pull away.

Refitting is a reversal of the above.