First of all Isolate the Supply
Light switches are functional items, and many of the basic varieties (made from white plastic) can look a bit plain. However, replacing these with decorative switches can add a stylish finishing touch to your home. Or you could change an existing switch to give you convenient, multi-way control of a light in your hallway, landing or stairwell.
Never take risks with electrical safety. Before you start any type of electrical work, you must follow these following safety precautions:
Remember to switch off the mains power at the consumer unit/fuse box. Isolate the circuit you plan to work on by removing the circuit fuse. Put this in your pocket to avoid accidental replacementOr switch off the breaker and lock it if you canAttach a note to the unit to advise you are working on the circuit.Check the circuit is dead with a socket tester or voltage tester/meter for lighting circuits. These confirm whether circuits are dead and safe to work onCheck all finished work with a socket tester (or voltage tester for lighting circuits) before usingFor your safety, these products must be installed in accordance with local Building Regulations. If in any doubt, or where required by the law, consult a competent person who is registered with an electrical certification scheme. Further information is available online or from your local authority.
Be cautious when opening up multi-way switches. The lights they control should take power from the same circuit, but if yours are incorrectly wired and take power from different circuits, there will be live cables at each switch position when one circuit is isolated. There is more than one method of wiring multi-way lights. If yours does not match the system shown here, that doesn’t necessarily mean they are unsafe