your gonna need some holes in the walls. cut a hole where you want the light, and see where the beams are, then cut a hole over by the wall, and in the wall so you can drill where you have to. then pull the wires. it minimizes the amount of repair work needed. i have pulled tons of wire in my house, but i dont have fire breaks in all walls, or even insulation. but my house is very old, and not every area has been brought up to code... yet