First make sure you are getting it done by someone who is licensed. They will check to make sure you even can have a tongue piercing. Some people can not have tongue rings depending on were their vain is. Yes it will hurt to get it. How much depends on the person. Just make sure you follow the care instructions that they will give you. It is important that you take good care of the piercing so that it does not cause you problems with infection. So think of the pros and cons. Then do what you feel is best for you. The pain is just part of the process.