I got hypno for my severe arachnophobia and it most definitely reduced it.
I did 3 sessions. I think if I continuously went back and got "top-ups" I could be completely cured of it.
But, I went from people talking about spiders making me sweat, not being able to look at pictures or videos without sweating/crying/having a bit of a breakdown to being calm when I see one (unless it's a shock/surprise - still have a few issues there) and being able to talk about it with no problems at all.
Note: I still don't 100% like it so please no photos here