Stop walking across a dark room to turn on the light. Install a 3-way switch and control lights from two locations.

It mentions that if a light fixture is between the switch and the panel it is common to switch ... so why change the conventional colors? In the diagram on the link they are using a three ...

To check if you have a neutral wire, you can pop open a switch box in your home, if you know how to do so safely (you can also have an electrician come do it). If you see a white wire coming out ...