You gotta get the 2 side bits off first, by getting the barbs inside the vents in, as well as all the side panel bits, lift em out using bits of card to protect the A pillar inner trims. Once out, undo all the visible bolts and those under the side trims, and you need to hawk out the center speaker grille for that one.
Then you can access and remove the center trim bits that allows you to remove the MID unit's screws and the Mid unit.
As Gavbriggs says, It's all much easier when you have the GTR to show you.
I need to change my MID as well, missing pixels but it's a big job i keep putting off.