How to open the phone?

[WebFreak]

There is a gap at the bottom right of the phone, where you can place your nail to separate the phone from the rear case.

uh is there anything else I need to take care of before that? It seems like an extremely tight fit, almost seems glued, and I don't want to damage the screen by trying to opening it too forcefully with that small notch. (and because I don't have tools to do this more gently)