There is no preparation for 5MeO per se, as no amount of meditation, yoga, mantra practice, etc. can save you during the experience, but certainly abstaining from alcohol, eating a vegetarian diet, avoiding conflict in the days leading up to the ceremony, and so on, are recommended by the facilitator.

As far as integration goes, I mean, who really knows the territory of the infinite such that they can help another through some difficulty in their own unique path? Most facilitators that I've seen just collect the rather large cash based consulting fee and move on to the next group, with a hug or pat on the back if a participant had a difficult journey.

I'm certainly skeptical when there's an undeniable profit motive involved, so the whole facilitator role is a bit overblown; there's no shamanic tradition behind Bufo (discovered in the 80s), it's just people that have had experience with the substance serving it to others, hopefully with good intentions.