I posted this in mental health and unfortunately didn't get any replies so, with the addition of an AIBU, I'm reposting here in the hope of some advice. 
How do I find/choose a suitably qualified, reputable hypnotherapy practitioner? For context, it is to work with an adult who thinks hypnosis may help them to overcome severe anxiety related to specific triggers most likely rooted in childhood experiences.
In general, are there specific qualifications or membership of professional bodies I should be looking for?
And more specifically, any recommendations in Glasgow / west of Scotland?
And AIBU to hope that hypnosis might be the breakthrough that's needed in this situation? The anxiety around these triggers has been 30 years in the making.
Thanks for any advice.