Using a plastic spudger, pry open the laptop case starting near the disc drive.

Continue prying open the case by using the spudger to open it in new areas.

Once there is enough space to allow you to grip the case, use your hands to finish removing it.

It may be difficult at first. If the plastic spudger does not work, you can try using a metal one. Using a hand to pull the case open while prying may help as well.