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Some work must be done by licensed Professionals and work must be inspected by a local municipal or county or state inspectors.

Test the wires for power using the circuit tester the tester should not glow if it does shut the power off to the correct circuit at the main service panel.

Switch Installation
The most common type of wall switch is a single-pole switch. It usually has ON OFF markings on the switch lever, and is used to control a set of lights, an appliance, or a receptacle from a single location. A single-pole switch has two screw terminals. Some types also may have a grounding screw. To correctly wire a single-pole switch, a hot circuit wire is attached to each screw terminal. However, the color and number of wires inside the switch box will vary, depending on the location of the switch along the electrical circuit.
If two cables enter the box, then the switch is in the middle of the circuit. In this installation, both of the hot wires attached to the switch are black.
If only one cable enters the box, then the switch is at the end of the circuit. In this installation (AKA a switch loop), one of the hot wires is black, but the other hot wire usually is white, A white hot wire sometimes is coded with black tape or paint.

Two cables enter the box when a switch is located in the middle of a circuit. Each cable has a white and a black insulated wire, plus a bare copper grounding wire. The black wires are hot, and are connected to the screw terminals on the switch. The white wires are neutral and are joined together with a wire nut. Ground­ing wires are pigtailed to the grounded box.

One cable enters the box when a switch is located at the end of a circuit. The cable has a white and a black insulated wire, plus a bare copper grounding wire. In this installation, both of the insulated wires are hot. The white wire may be labeled with black tape or paint to identify it as a hot wire. The grounding wire is connected to the grounded metal box.