How do you change spark plugs on 2009 3.3 Sonata?

To change the spark plugs on a 2009 Hyundai Sonata with a 3.3L engine, first, disconnect the negative battery terminal to ensure safety. Remove the ignition coil covers and the coils themselves to access the spark plugs. Use a spark plug socket and ratchet to carefully unscrew each old spark plug, then replace them with new ones, tightening them to the manufacturer's specifications. Reassemble the ignition coils and covers, and reconnect the battery terminal.