Regarding the choice between a course at home and making a real class. I have to admit I'm a little biased because I'm really shy and kind rather be right at home with my family.
So I always choose a course of study at home where I did not go out and be forced into a classroom situation. The best online Hypnobirthing home study course By Kathryn Clark is a good choice if you like to study from home and learn.
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However, there may be advantages in a classroom situation. If you like meeting new people, it might be a good idea. You can also meet moms who might become friends – and your baby is close to the age.
Some women also really like the motivation of the instructor. If you are more motivated with a teacher that you are self-learning, a class might be a good idea.
You can also ask questions to the teacher. Although it's not quite as big of a deal with Hypnobabies – Home study course has a list of active emails and the author of Hypnobabies is very active.
If you have questions, you will have a quick response, useful. So my point of view, just based on my personal preference – is that the course of home study, where you can go at your own pace and in the comfort and privacy of your own home is the way to go.
You weigh the options and decide what is best for you!