I used the tile cutting bit. First I took a pill bottle of the proper size to draw the door out (I'm not real good with free form). Then, after soaking the pot over night, I first scored the line and then just started cutting. I used the same bit to smooth out the edges once i got the door cut out.....don't want those little guys to hurt themselves going in or out??? :)
Here's a picture of another one I did.
