As with any drug psychedelic or otherwise, i advise that you just don't put all your weight and hopes into it, otherwise like overhyping a experience you can be let down and not get everything you thought you might having put so much thought power into "This is gonna work" or "I hope to god this cures me" your already putting up an insanely high barrier to instant removal of not just need but feeling or craving at all for said substance and to often more than not, this is a not going to help the process and only hinder its already possible avenues of success.
None of this is to speak against the possibility of a fast near instant recovery in some people, and not to say this hasn't happened, however it is realistic to walk into this with an open mind and no expectations will go a long way in the experience.