For information on how to remove the OEM HU, dash, panels etc ....
and search under Accessory Installation Guide as publication type - (Its free)
There are 3 guides (Aux Input Jack, Power Amp, and Power Outlet)
that have pretty good instructions. You'll find where all the panel clips/screws are located.
Didn't know you can post a direct link as iLoki did above. Here they are: