How do I fix a small hole in my carpet?

If it's a cut pile plush, it should be fairly easy. Using residual carpet from the install or corner of closet or obscure area, cut a piece the approximate size of the hole. Using gorilla glue from Home Depot and a really sharp pair of scissors or razor blade, cut to fit and carefully glue the perimeter of the backing of the carpet. Place the donor piece in place and put a book over it until it dries. Using your scissors, brush the carpet back and forth and trim any taller tufts until it looks even. Bonus: for color difference, typically from wear or soil from foot traffic, spray a little Folex on the patch and surrounding area and scrub until the colors blend.