How change spark plugs on a 1998 Buick century?

To change the spark plugs on a 1998 Buick Century, first, make sure the engine is cool and disconnect the negative battery cable. Remove the ignition coil or spark plug wires to access the plugs, then use a spark plug socket and ratchet to unscrew the old plugs. Before installing the new plugs, check and adjust the gap if necessary, then thread them in by hand and tighten them securely. Finally, reconnect the ignition components and the battery cable.