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

In a three-way ... wire with pliers. You may have to strip some of the sheathing to expose the wires before winding them onto a new light switch. Be careful not to expose too much. Step 4: Wind ...

leaving them hanging on the wires to check the 3- and 4-way switch legs for problems. After about two hours we had traced out all the wiring and drawn up a quick sketch of the switch/wiring layout.