Trouble with hypnosis

Hi there everybody. I've been lurking for the most part for the past week or so since I joined, downloaded some files on the ipod and listened to them whenever I got the chance. I've seen hypnotists before and I've tried self hypnosis through cds before, But I find it nearly impossible to actually fall into a trance and have any suggestions actually make any affect on me. My question is, Why are some people like this way and is there anything else I should be doing other that keep listening and using alot of induction improvement files? Thanks in advance for any feedback.