the screen cover pops out, one side has clips and the other side has little plastic prongs that sorta hinge in there.... the OEM speaker will come out with relative ease but getting the other in will take some hell, dont worry if you use a sorta weird rotation like .... hmmm put the speaker in as far as you can then rotate it counter clockwise toward the back and push it in. at this point it will help to have a friend pullin on the plastic some so you have a little more leway. this worked for my JL Audio XR's (deeeeep cone) so i cant imagine you could have a speaker that goes back any deeper.
hope that helps.