The wiring is simple enough for anyone to do. Since the relay shown handles 10A at 120 volts, you can use it to control almost any type of switched device, but be sure to check the tag on the device you are trying to control. Half of the relay is unused, so it can be used as a second switch if needed. The IR detector has a 120 degree range of detection, but if you want to make it more directional, you can cover parts of the sensor with black tape. Make sure you cover all connections so that they cannot short out.
Heat shrink tub is available at most hardware stores and is easy to use.
Just remember to place it over the wire before soldering. After completing the connection, slide the shrink tube over the connection and heat it with a match or the soldering iron. I have built this device, but your tools and skills are unknown to me. Proceed at your own risk. I also do not endorse any of the products here except the FerretTronics chip.