On mine, a Marantz, I had to remove trim that clipped in then remove about ten screws. The screen and the protective screen were held together in a plastic sheath. It was very easy and I just looked to see how it was together as I went. It should be in your manual.
Tip on room lighting
I have a 60" tv with a protective clear plastic screen over it. No matter where I put my light I could see its refection in the screen. After several attempts to move it I put it behind the tv. I cant stress what a difference this made to the quality of my picture. Better colors, blacks, and a much better depth of field. It works so good I thought I would pass on the usefull tip.