Flat, clean work surface
4.5mm Security Bit + Screwdriver handle
Small Philips Screwdriver
Xacto Knife with sharp blade
Small metal file or low grade sandpaper
Small lid or container (to put screws into)
Push pin or Needle
Q-Tips and Water
The only thing you probably do not already have access to is the Nintendo Security Bit for their special screws. You can easily find it on EBay (paired with it's 3.8mm counterpart for opening up the carts) between $5-10. If you need it, click HERE
and order yourself up some.
I've read and tried some other methods for removing the security screws but I couldn't get them to work myself. Do a quick google search for alternate methods if you don't feel like paying for the bit.