Remove spark plug wire with a spark plug cable remover tool. Blow out debris around spark plug. Remove spark plug with spark plug socket, extension and ratchet.
Use a gap gauge to set the proper gap on the new spark plug. Screw it in loosely by hand. Then tighten to the published torque spec using a torque wrench. Apply a dab of dielectric grease to the tip of the spark plug cable and reinstall the cable. If you don't have those tools, don't try it.
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