I had a bit of a different experience... I went to a mass hypnosis session with a hypnotist who comes to town. It's something you have to be willing to accept and want to work.
Even when you're hypnotized it can seem like you're not so don't worry if you're not sure while you're doing it. My experience went really well, I wasn't sure I was hypnotized at the time but the differences I and others have seen in me are huge!!! I used to be a horrible emotional eater and decided to try hypnosis after I realized it really was all in my head. It was safe, exciting an even a little fun. He started out explaining what it was and what exactly he would be doing. Then he put us through a little session that he said would make us more open to the hypnosis (I'm having a hard time coming up with words today so let me know if I need to explain this better). After that we had 2 sessions of hypnosis where he gave us happy and healthy ideas about eating and weight loss. He must have really done his homework because he hit every suggestion and problem I thought I could possibly ever have. I purchased a set of his CD's that I listen to now as a refresher... they have really helped to keep me going.
I guess your experience will really depend on the hypnotist. I think the one I saw was an American but I'm not sure how/when/where he tours. He has the WORST cheesey radio commercials but I would recommend him to anyone. You can also purchase his CD's online, his web site says listening to the weight loss set is the same as being at one of his seminars but I think there is really nothing like actually being there.
Really worked for me Let me know if you want his web site.