You'll usually need a spark plug socket attached to ratchet, extension pieces, and a gap gauge to adjust and measure the gap between new plugs. While a special wire remover exists, you can easily loosen the wire boots with everyday tools. A torque wrench must be used to tighten the new plugs correctly. You should buy the replacement plugs early, measure the right gap on them, and switch them one at a time, making sure you get the right types of plugs for your car's engine. Once the engine stops creating heat, you can safely take off all the plugs. During the cooling time, examine the new plug wires for problems and keep them matched to the specified gaps. According to the manufacturer, you shouldn't inspect the gap between the electrodes on platinum- or iridium-tipped spark plugs. When the engine has cooled down completely, take out the spark plug wire from one spark plug by grasping and pulling only on the slim base of the wire. Before taking out the spark plug, blow compressed air from air tools into the spark plug hole to clear any dirt, using compressed air in the process eliminates dirt or foreign material from entering the cylinder when you remove the spark plug. Unscrew the sparking plug by putting the socket onto its head and turning it in the opposite direction (counterclockwise), whether you need a socket and extension to reach it or not. Check the spark plug for how the engine is running, and apply a thin shell of anti-seize spray to the threads before you put the new spark plugs in place. Insert one of the fresh plugs into the hole until it cannot rotate anymore with just your hands, then use a torque wrench or ratchet to tighten it. Put some rubber hose over the end of the plug to help guide it in while you screw it in. Keep the boot of the spark plug wire fitting onto the new spark plug by turning it clockwise. Repeat this same step on all the spark plug wires one by one to avoid mixing them up.