I am reluctant to throw out a gratuitous quote of rate of success, since I can not speak for every surgeon. Generally, we do not do a surgery with the anticipation of it not working. However, having said that, there is no one who does surgery who is successful 100% of the time. Having also said that, every surgeon probably has a patient who they have done everything picture perfect, by the book, no problems etc and yet there is still a less than desired result according to the patient. There are also other patients who for whatever reason, the result is not what was desireds, and yet they are extremely pleased.
You should not have an elective surgery unless you fully understand the potential risks, hazards and complications that could arise. You should discuss you concerns with your doctor.