I currently have 2 lights (one can light and one fixture) hooked to 1 switch. I would like to add a switch on the other side of the room. I understand I would need to replace the existing switch with a 3-way and install a new 3-way where I want the new switch. I looked at the existing switch, and there is not power coming in there, so the power must be coming in at one of the lights (I haven't been in the attic space yet to see which light the power is coming in). Could anyone please help me with a wiring diagram to install these 3 way switches? Thanks.