How do you change the spark plugs in a Ford Fiesta?

To change the spark plugs in a Ford Fiesta, first, ensure the engine is cool and disconnect the battery. Remove the ignition coil or spark plug wires, then use a spark plug socket and ratchet to carefully unscrew the old spark plugs. Install the new spark plugs by hand to avoid cross-threading, then torque them to the manufacturer's specifications. Finally, reconnect the ignition components and the battery.