I can only compare it to a Kobo Touch. I would say that it took more time to open the Aura since the plastic is thinner (and seems softer) while the gap between the bezel and back case is trickier to get into in order to pry it apart.

The case is held together by plastic clips. There are six on each side and they are spaced evenly. Now that I've been inside a couple of times, I can simply force my fingernails into the seam between the bezel and back case, pry it upwards a little bit, use another fingernail to pry the side of the back case outwards, then just run the second fingernail down the edge until it pops open. I worked from a corner, doing a long edge first then a short edge. Even with the four edges free, the bezel is attached to the screen with tape. The two sided tape runs all of the way around the opening. Just pry it apart slowly with your fingers.

Opening it the first time seemed harder. I'm not sure if it's because I didn't know what to expect or if it's because the plastic was stiffer. (Ken Maltby offered good advice, but I'm more of a tactile person.) Either way, I found myself using a small screw driver to do the initial prying apart at the corner and using a piece of stiff plastic to run along the edge. The screwdriver definitely dinged the plastic in the corner. Then again, the plastic is soft enough that my fingernails wire nibbling away at the edges when prying.