Ok cool. That big ole piece is held on by just clips (two styles)
There are roughly 12 clips (10 outside=4 on the top by the lock, 2 on each side, 2 on the bottom by the glass, then 2 in the center)
You can pull these off or use a taped up long screw driver (standard head) to disengage them.
Then there are 3 just pins in the middle that simply support the plastic.
Isn't to hard, just take your time, get a flash light to help see in there once you get a few disengaged.