Depending on the degree of indoctrination (brainwashing) we absorbed during the time in the cult, leaving will come as naturally as anything else which we have outgrown in our lives.

So here is the point which can make things difficult for one person and easy for another.

It's like in health/sickness: some are affected more, others less. And depending on how much affected one was (or still is) or, how strong the personal immunity level, determines the remedies one has to take/use in order to leave and not even look back.