The wiring of the lights and the usb charger may be considered a simple operation unless you have never done it. The wiring of the usb charger has no polarity priority. It matters not as long as one wire goes to the hot and one to the ground. You can wire it in to the cables or cable coming from the alternator/dyno hub using piggy back connectors. twist an sadder. There is even a new part from Schmidt to make it pretty. Peter White Cycles has some tutorials on connectors and wiring your lights.