What all is needed for DD install?

let me know when, and i'll probably be there too. i put one in my 08 with onstar/bose, so i'm what you might call "experienced"
 
lol, still didn't buy shit. Not really in a rush. But soon, I'll probably wait and put it off until semester is over.
 
The one with the chimes and such should already have it

The pac harness has plugs on both ends, one plugs into the factory harness and the other you gotta have ^that plug, you plug it onto the pac harness and wire it up with the harness for the dd
 
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what I have minus head unit harness