Id reccomend that you find a hypnotherapist with plenty of experience...it can take as little as 6 weeks to qualify.
It is an amazing experience, soooooo relaxing. You need to believe in hypnotherapy for it to work, you can not be hypnotised against your wishes.
You may be given a CD to listen to, this just reminds your sub concious what the hypnotherapist has already told it, id reccomend using the one you maybe given or sold.
I hope this helps