im installing mine tomorrow. here's how im going to do mine. in slot 20 of your fuse box located in the passenger side of the center console (by your left foot when sitting in the passenger seat), there is a fuse that controls your sunroof. right above that one (slot 21) is a spare spot. in that spot i will place a 10 amp fuse with an add-a-circuit feature built in. from there i will run a wire to the positive side of the first neon (located under the drivers side dash).
the neons i bought are chain-able so i can just wire one into the fuse box and chain the rest off the first one. 10 amps will be plenty of power for this. slot 21 is made to function the same as the rest of the electronics in the car (10 min with no key after shutting off as long as drivers door stays closed, etc.)
as for a grounding spot, either a screw on the same side as the fuse box, or there is a great grounding screw on the opposite side in the same location.
as for switches, im putting mine in the little spot under the hvac controls where the 12v cigarette outlet is. i will be taking the piece off, drilling for the switches, placing and capping them. shouldnt take more than two hours at the most.
hope this covers everything. ill post pics when i'm done. im also changing the color of my hvac controls and seat warmer buttons since ill have the faceplate off.