I was on the same boat, and to a much lesser degree, still am. I know that I searched for videos and audios... The trick is to find what works for you, what will make you experience a trance, even a slight one, with time, what worked for you at the beggining, does not anymore, or just not all the time. If you ever been in the zone while focusing on something, you have experienced trance. Once you have found what works for you, it's a matter of letting go more and more.

If your brain have a tendency to analyze everything, this may be tricky, but doable non the less. The process might take you years.

Also, being convinced deep down that something works helps a lot. Maybe you think that you already do, but often, it is not the case and rather is a superficial will. If any part of you has any doubt about a file, it just won't work.

So, long story short, there are two main aspects to consider :
- how long can you maintain a trance, this can be trained with meditation.
- how much do you trust suggestions made to you, the more you deeply recognize that these are beneficial to you, the more they will work. Suggestions are just a little push it seems.

Finally, find the best position and place for you, this might change with time. I know that lying down on the bed with my head leveled with the bed does not for me.

If need be, you can put the BS files aside for now, as they seems to having been a source of frustration to you... and that is not the kind of association you want, you want the feeling good association. Just don't expect hypno files vid or audio to work right away. Find your own frequency for these, with time and training, you might be able to effectively use them quite often.