Unable to get the back screws off.

Hello,

I was just wondering if anyone has some suggestions in getting the back screws off the 3ds XL. I followed the guide and even bought the required/recommend tools from this site and it seems that the head type 000 is too small to catch and just spins around. I have tried using the next size up and I was able to get two of the screws outs. As for the reset of the screws they do not seem to be moving at all. I know I have thread at least one screw so I was wondering if anyone had some suggestions as to what I could do next?