Wiring a three way switch is possible to do yourself but obviously it’s more difficult than a two way switch. Basically, this three way circuit will allow an electrical item to be operated from more than one location. To do this yourself, it is best explained using diagrams which you can compare to the switches and wires which you will be dealing with in the home.
There are a number of websites which show clear and easy diagrams of this procedure. It is best to have a look at a few before you start to ensure you have a diagram which you feel comfortable with and feel you can see how each step contributes to the overall task. Here are some of the many websites which offer detailed diagrams of wiring a three way switch; www.how-to-wire-it.com/wiring-a-3-way-switch.html, www.howtowireahouse.com/How_To_Wire_A_3-way_Light_Switch_Or_ You can also find video clips of real life situations on YouTube.