The silver fascia that houses your head unit should almost literally pull off (with a bit of effort) Reach under the lip that is underneath the climate control knobs and pull the facing up and off, being careful not to damage the clips. From there you undo the 4 Phillips screws and the head unit slides right out. I installed a Kenwood KVT - 522DVD without much hassle, only things I needed were the iso and steering wheel adapters. I'm not sure if you'll need those for your unit.
I'll add pictures tomorrow on the removal of the fascia.