How do you change spark plugs on a 2004 RAV 4-cylinder?

To change the spark plugs on a 2004 RAV4 with a 4-cylinder engine, first, ensure the engine is cool, then disconnect the negative battery terminal. Remove the ignition coil or spark plug wire from each spark plug, and use a spark plug socket to unscrew the old plugs. Install the new spark plugs, ensuring they are properly gapped, and then reconnect the ignition coils or wires. Finally, reconnect the battery terminal and start the engine to check for proper operation.