I have two 3-ways at both bottom and top of stairs. To alternately control each light from either position. BUT, I have only one power source from circuit box coming into bottom of the stairs. I also have an unwired connection (gotta go somewhere) to the bottom lamp. I am at wits end.I have followed faithfully all other instructions but they all refer to a power source at switch to switch to lamp; the bottom appears to be switch to lamp to switch? Am I nuts/ I'm at least at wits end. Help!