I have a existing light in upstairs hallway with power leading to a switch with 12-2 wire. I am trying to use power from light into first switch then come out of switch with 12-3 wire and go too second light on first floor, through second light to second switch on first floor. Both switches are of course 3-way. My brother and I have about 4 hours into this and no luck any insight would be greatly appreciated. Thanks Wayne R.