How to use Chopsticks
Pick up the chopsticks, which are usually placed on a hashi-oki (chopstick rest) with your right hand. If the chopsticks are wrapped in a hashibukuro, (paper sheath) remove them.
1. Use your left hand to hold the chopsticks. If they are disposable wooden wari-bashi, split them at this stage. I've seen many people rub the chopsticks together at this time to remove hard edges and loose wooden fibers, but it isn't polite, as it implies the chopsticks aren't smooth enough for you.
2. With the support of your left hand, hold the chopsticks by placing them between your right thumb and forefinger.
Fix the lower chopstick between the tip of your middle and ring fingers. Place the upper chopstick between your index and middle fingers. Press both chopsticks in place with your thumb.
By moving the upper chopstick with your thumb, forefinger and middle finger, pick up a morsel of food between the pointed ends of your chopsticks and carry it to your mouth. Remember, only the upper chopstick should move. The lower one stays put. It's customary to keep your left hand under the food as you bring it to your mouth, in order to catch any juices or in case the food drops.
5. If a piece of food is too large to eat in one bite, don't cut it with your chopsticks. Simply bring the whole piece to your mouth and take a bite, returning the remainder of the food to your plate.