If you only buy a single grooming tool, I beg you, let it be a large metal comb! You will grow to love this tool. It removes stool caught in fur, it de-tangles mats and also helps to prevents new ones. It significantly slows the accumulation of shedding fur on all your furniture. This one is large about nine inches long and has wide spaced teeth on one end, narrow on the other.
I use an e-collar everytime I groom a cat with a questionable personality. The collar prevents a cat from biting but also keeps them alert to their environment. A cat muzzle, which fits over a cats face, can sometimes panic an already frightened cat. The e-collar fits around the neck and simply creates a barrier between their sharp teeth and your human skin.
This is a Whites Nail trimmer. I think this is the best little cat claw clipper on the planet. It is the perfect size for most hands and is very well made. If you purchase one of these you will have it for many years. Steer clear of the guilotine style or dog clippers, generally they are too large and are difficult to work with on small cat feet.