How do you change spark plugs in an '03 Mercury Marauder?

To change the spark plugs in an '03 Mercury Marauder, first ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil packs by unbolting them and gently pulling them out, then carefully detach the spark plug wires. Use a spark plug socket and ratchet to unscrew the old spark plugs, and install the new ones by hand to avoid cross-threading before tightening them with the ratchet. Finally, reconnect the ignition coils and battery terminal, ensuring everything is secure.