Heres a trick if you get a stripped screw.
1) Take a blue bic pen. (The ones with the non-see through blue plastic.).
2) Take ink out
3) Light pen plastic on fire, and wait until it melts.
4) Blow flame out and shove onto screw.
5) Wait 5 minutes until it hardens.
Make sure your in well ventiliated area.
Ive done this trick to take apart my gamecube!