for power positions... look in the tutorials or the wiki???
for LED + RESISTANCE CALCULATIONS...
go here:
http://ledcalc.com/i have pics of possible power locations, the easiest is the bottom of the mobo or the power board...
Click to Enlarge:
:::ON MOTHERBOARD:::
:::ON POWERBOARD:::
**When soldering to the motherboard remember that there are parts that sit against the mobo once the psp is together, i recommend routing the wires up from that location if it is decided to use that location