I had gone to this author for past life regression decades ago, and at the time, read the 1st edition of this book. He was very helpful at the time, teaching me how to resolve my traumatic memories and intrusive thoughts and images, which training I continued to use.
Recently, the same material came back insistently, and I introduced my therapist to this past-life approach though this book, and this has been helpful.
Overall the book seems now to be a bit pedantic, one should feel free to skim - but it's good stuff overall.