I've heard that paring is an option, too. Paring involves using a knife to basically whittle away the edge of the nail, and sculpt it into place. In those movies when the tough-looking pirate is poking the ends of his fingers with that curvy blade, I'm pretty sure he's supposed to be paring his nails (sailors needed short nails for the ropework, I think...). I've tried it a couple of times with moderate success, and only then with a steel blade. It takes some getting used to.