Anyone who has ever been taken in by a con artist in the flesh has a certain appreciation for how one's immaturity has set one up to believe what one wants to believe, and how difficult, yea impossible, it is to root out every last vestige of that immaturity so that one can look at every potential relationship with clear-eyed innocence. (Don't ask me how I know this.)
Con artists do not come with credentials. It's up to us to learn to stay away from them. No doubt some have found true love at the local bar, but that's probably not the best place to look for it.
Likewise, seeking wisdom from uncredentialed spooks is fraught with danger, I would say. At the very least, it is the danger of learning something about yourself that, in hindsight, you would have been pleased to learn in less expensive ways.
To the extent that we harbor illusions and delusions (and we do!), these will be mirrored back to us, one way or another. If we take the bait and run with it, we miss the lesson, and elaborate the illusion--going nowhere, but enjoying the ride, for the time being. Con artists are specialists at giving us what we want...until we're hooked.
[
If you're going to truck with spirits, realize that, ultimately, you're trucking with your own subconscious, and that maybe a more organic means of growth, like, say, prayer, would be more healing, if less exciting, I would say. Most of us are ill-prepared to deal with our own subconscious minds, but like the Fool in the Tarot deck, off we trek. It can't be avoided, I suppose, but, still, I had to say it.
I wouldn't suggest you read the book, but the review might be instructive.