Step 1: Removing the Cover
First, use a flathead screwdriver to pry the mesh away from the cover (do not try to lift the cover up, you will just break things). Start to pry in the middle of the book and you should see two plastic snaps lift up, I put a razor blade between the snaps to prevent them from locking in again. Do this to both sides.
Second, begin to pry the binding area of the book away from the mesh. Pry in small amounts, alternating from one end to the other. When there is enough of the gap, you will be able to slide the cover off of the mesh with your hands.
Step 2: Remove the Hard Drive
First, remove the plastic led extender (I don't know what this is really called, but it redirects the light to the front of the book).
Second, use your hands to lift up the front of the metal insides. Lift the front up until it is high enough to pull the back out of the mesh.
Third, remove the two screws holding the sata controller in place. Then slide the sata controller down to remove it.
Fourth, remove the four screws holding the hard drive in place and remove the hard drive.
Now the enclosure is fully taken apart. If you decide to put it back together, just follow the steps in the reverse order. There is nothing special you need to know about rebuilding it.