Stripped screw near the camera

Hi, I'm trying to replace the battery on my 3GS. I was able to remove all the screws in your guide up until the screw near the camera, and it won't come out. I've tried for days. I just ordered your screw removal kit and none of the tools were small enough to get into the screw itself and remove it. Maybe I'm not using it correctly, but it doesn't seem like the right fit here.

I'm approaching my wit's end. What can I do to remove a stripped Philips #00 screw?

Also, what is IFixit's return policy on tool kits?