What are the necessary precautions to take when handling furnace wires?

When handling furnace wires, it is important to first turn off the power to the furnace to avoid electric shock. Use insulated tools and wear protective gear such as gloves and goggles. Make sure to follow proper wiring diagrams and avoid touching bare wires with your hands. Inspect wires for any damage before handling them and always work in a well-ventilated area.