The purpose of educating your clients about how the Mind works is to prepare them for where you're going to ask them to go. You're going to be asking the client to regress into painful events from the past.
Educating your clients beforehand can help to remove a lot of resistance to "going there" simply by removing many of the "unknowns."
So, what's the best over-all Mind model for doing this?
Learn how to educate your clients to establish a Contract specifically for Regression to Cause Hypnotherapy.