When going through any treatment, it is vitally important to talk through the situation with a doctor or surgeon, in order to see if the treatment id right for you. You also have to know that you can trust the person to carry out the treatment safely and reliably. So the main questions you should really ask include asking for pictures of previous people who have undergone the treatment under their guidance. Ask for both good results and bad results (because there are bound to be bad ones as well as good ones!), and that way you can make your own mind up as to whether you want to risk using them or not.
Another good question to ask is whether they have credentials, what training they have undergone and how many times they have performed the procedure you are going to be potentially having. Try and get them to give you a long term plan as to what will happen before, during and after the treatment. You need to know that you have support if needed afterwards. Always have a consultation; after all you really do not want to risk your health!