The Drive unit itself

For the lite-on phillips drive, you pretty much have to use brute force and a little prayer. Once you remove the rubber piece near the back (sound dampner and it keeps the drive from wiggling), remove the sponge foam strip at the front (allows the drive to close silently) and the 4 screws at the corners.

You then remove the top piece (some videos will actually have you remove the top spin plate, but that is not necessary). Slide the drive components towards the front, after lifting the front to clear the base pins from the other half of the case.

Then carefully remove the drive tray from the side lips holding it in place, starting from the back of the drive and using it's flexibility to free it one tab at a time towards the front.