If for some reason your socket doesn't have the gripper in there, you can improvise. Cut off a half inch or less of electrical or masking tape and stick it onto the inside of the clean socket. This will make the socket grip a little more tightly on the spark plug so you can hold onto it.
With your ratchet wrench set to loosen (that's counter-clockwise) slide it over the end of the plug, being sure to push it on as far as it will go. Now remove the old plug.
