I also agree that nothing can prepare for the non-duality - but preparation can help you make the most of the experience & retain what was meaningful to you.
You'd be surprised how far we've come in terms of knowledge. We do have the practical models to navigate the dual experience having had the non-dual experience. Understanding that you are the embodiment of the Infinite through your direct experience isn't an end in itself. It is a beginning.
I have developed "business models of Being" for a lack of better terms that frames how to operate in an optimal fashion in the practical world of service.