"The shape of the nail can help to elongate ones hands and improve the overall hand appearance. Never ‘saw’ back and forth on the tip of the nail. Rather than filing straight across, file at an angle so that you have less of a chance of bending the nail if you have weak nails. Remember to look at the hands from every angle. File from each outside edge toward the center of the nail. When filing at an angle, you’ll be a lot more careful.
You also want to use a gentle file, make sure that it’s not very coarse. Stay away from metal files, especially if your nails are prone to breaking because one false move and you can mess up the nail."