All hypnotists work slightly differently. We’re trained by different people (for me, that includes a course run by Paul McKenna) and then as we practice hypnotherapy our style evolves.
It’s important that you choose a hypnotherapist who works in alignment with your onjectives and your style.
Some people find that they can get 95% of the benefit from hypnosis for weight loss just by listening to an MP3 recording every now and then. If that’s something you can get away with, it’s far and away the cheapest and most convenient solution as you don’t need to book an appointment for a specific time on a specific day.
But in the real world a lot of people find that part of the weight loss conundrum is lack of will power and that includes making the time to listen to an MP3.