Here comes the fiddly bit and if you ask me; overkill engineering.

In total, there are 12 plastic clips retaining a cage holding the hard drive in place. 4 on the long sides and 2 on the short. Using a spudger, run the plastic in from the connectivity side.

These clips are remarkably bendy, but they will break, mine did. The point to remember is if they do, it's honestly no hardship as the screws are really the guys that keep the drive in place anyway.

Once the assembly comes away from the white plastic top there is a black plastic piece that separates too. You are left with a thin steel enclosure protecting both the drive and logic board electronics.