I also think this is pretty easy. just remove the old led,solder the power led, then the charge leds other end and one wire. i did this sum month ago and it was my first mod (i think). took only some 15min from a kid like me.
But im not very good at soldering, ive seen that psp phat screen wiring, it was awesome, i could never do it!
so like 2-3 out of 10.