It's a little difficult, but once you've got the screws odd you can start to pry the back off.

I started with the section of the hinge by the power plug, then left the card there to hold it open.

After that I used a second card to pry the rest of the hinge section open, and then worked my way around the sides of the laptop.

Once you've got it worked around, the back will pop right off. There's no adhesive holding it together.