A useful video to reference whenever you want to dismantle your PSP, either to install some hardware mod or to find out where all those little Loco Rocos go after you turn it off. Note that this will void your warranty (obviously), so unless you're at least a little bit skilled with electronics assembly/disassembly, leave it to a professional.

Dismantle a PSP In Five Minutes Or Less [Aeropause via Kotaku]