Is there any chance of hypnotism aiding in an attempt to rid oneself of the evils of heroin addiction?

First and foremost heroin addiction is a *physical* addiction, and that won't be cured by hypnotism - you'll need to take - probably - methodone to alleviate the pain you'll feel on detox. Once clean, hypnotism may help you stay off of the stuff, but I'd suggest counselling groups in addition.