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You need to have something against your ear so that you can push the needle through your ear without accidentally piercing your neck too. A cold, clean bar of soap or a cork are both good choices. Avoid apples or potatoes, even though that’s generally what’s used in the movies. Apples, potatoes, or any other food may have bacteria on it that could infect your piercing. If possible, have a friend (or friends) help you with the piercing. Either have them hold the cork against the back of your ear or, if you trust them immensely, have them do the actual piercing. This whole process is much easier to do when you have someone there to help you. The needle should be perpendicular to your earlobe. This means that it should make a roughly 90-degree angle with the mark that you made on your ear. Positioning the needle this way will allow it to slide more effectively through your ear. Make sure it goes through the spot you have marked. You may hear a popping noise when the needle goes through--don’t freak out! Wiggle the needle, then keep it bent at an angle. If you are using a hollow piercing needle, thread the jewelry through the center of the needle. After you've pierced your ear, and while the needle is sticking through the ear, place the shaft of the earring into the hollow tube of the needle and then push it all the way through the ear. This will leave the earring sitting comfortably in the new hole. Slowly remove the needle from your ear, making sure that the earring stays in place. Be aware that this will most likely be painful, but try not to rush it, as you don’t want the earring to fall out or else you will have to go through the piercing process again. Be aware that the hole you have made could close up in minutes if left without an earring in it. If your earring falls out, resterilize it as quickly as possible and try to fit it back through the hole. If it does not go through, you may have to pierce your ear again.
Find something sturdy to put against your ear. Place the needle in the proper position. Take a deep breath and stick the piercing needle smoothly through your ear. Put the earring in your ear. Remove the piercing tool.