anyone know an easy way to take off the black rubber "boots" on the spark plugs so that I can get started and put in the new ones? I have been struggling for an hour and can't get the darn suckers off. Swearing and bloody knuckles won't help me, there in a tight spot. I don't wanna use pliers, cause I am afraid I will cruch something. Any help or advice if you guys can? Thanks..