Your baby's nails may be softer and more pliable than yours, but make no mistake, they're sharp — and a newborn, who has little control over his flailing limbs, can easily end up scratching his own face (or yours) as he reaches out to explore. A newborn's fingernails grow so fast you may have to cut them as often as a few times a week; toenails require less frequent trimming.
The easiest way to trim a baby's fingernails may be to just peel (or bite) the ends off with your fingers. Your baby's nails are so soft that they will easily rip right along the tops of his fingers. And don't worry — you won't rip the whole nail off this way. You can also file them down with an emery board, if you have the patience.
Otherwise, you'll need to invest in a pair of baby scissors or clippers, and grab a partner. One of you can hold the baby and keep him from wiggling too much while the other does the job. (You may want to try it while he's feeding or sleeping so that he'll be calmer.) Press the finger pad away from the nail to avoid nicking the skin, and keep a firm hold on your child's hand as you clip.