Professional body piercers know that the key to a comfortable and low pain body piercing is the use of extremely sharp piercing needles. Body piercing needles are hollow and bevel cut to insure the sharpest tips possible. The sharper the needle (generally), the less pain will be felt by the customer, since a sharper needle will go through the tissue with less resistance and tearing.
Make sure you purchase your body piercing supplies from a respected company that carries laser cut tri-bevel body piercing needles that are pre-sterilized and individually packaged for ease of use. Not only will your job be easier but your customers will thank you.