Birth control implant?!?

So on Wednesday the 9th of March I am going to the Dr. To get the birth control implant in my arm. I am 14 and this is the first type of birth control I have ever even looked into getting... I was just wondering if any one can give me any advise or tell me if its going to hurt and if any one has had any problems with the implant itself?!? Thank you to any one who can help or even just be supportive!