I bought this case.
Now I've got the upper part off the Pi, but the bottom part isn't that easy to get off the Pi.
Is there anyway to easily remove the case or is the best way just pulling very hard?
I find a small flat-headed screwdriver to be extremely helpful in these situations.
Just find a small crack between the case and the Raspberry Pi, then carefully insert the screwdriver. Use the screwdriver as a fulcrum to lift the Raspberry Pi out of the case (keeping the case stationary). Please be gentle.