I'm not sure what a grease lightning comb is, but most anything that is fairly coarse, (not real narrow between the teeth) will work. A brush might work to fluff up the muffs, but it won't help remove the wax from the base of new feathers in the hackle. I know a lot of people use VetRX, but it is used to clear air passages, and always makes me think the bird from with the aroma emanates might be sick. Plus I don't care for the smell anyway, so I just don't use it. To each his own I guess. Good luck with your first show! Like Russ said, just relax and enjoy it.