How do you change the spark plugs on a 1991 Toyota Camry?

To change the spark plugs on a 1991 Toyota Camry, first, ensure the engine is cool and disconnect the battery. Remove the spark plug wires by carefully pulling them off the plugs, then use a socket wrench with a spark plug socket to unscrew and remove the old spark plugs. Check the gap on the new plugs and install them by hand to avoid cross-threading, then tighten them with the wrench. Finally, reconnect the spark plug wires and the battery.