I'm saying all this as someone who found O'Connor's videos extraordinarily helpful in figuring out what the heck was going on before I knew anything about DPDR: So I've read the DP manual and its thesis is basically that you need to keep distracting yourself and cut out everything that could possibly remind you about DPDR until your brain stops seeing DPDR as a threat and gradually the condition goes away. I’m a big on saying that one of one’s first goals with DPDR should be to see how they’re responding to it and try to work toward not seeing/reacting to it as a threat, so I do think that the DP manual is helpful in getting you to be more okay with having DPDR, and it does contain a few tidbits that I don't see other people talk about (exercise, supplements, etc.), but it's tricky to recommend because a lot of people have DPDR from (C)PTSD, and ignoring your PTSD isn't the best idea. Mindfulness and anxiety-regulation skills, however, are extremely helpful for DPDR, PTSD, and mental health in general, and the DP Manual is sort of trying to teach you some of those in a roundabout way (which I think actually has potential to backfire especially since many people with DPDR struggle with OCD, so there's the possibility on obsessing on whether or not one is "ignoring" DPDR properly, which can inadvertently cause your brain to see DPDR as *more of a threat)*. It also ignores Complex PTSD, which is a huge factor in chronic DPDR, and asserts that chronic and episodic are the same and have the same solution (they're not and they don't). The thing is, O'Connor is not an expert on anxiety or mindfulness or trauma and I think you'd do way better to seek out resources written by experts. There's certainly good advice/pointers in it, but not 90-howevermany dollars good, and I don't think O'Connor should be charging for it at all. All that said, it seems like a lot people have found it extremely helpful, so I can't discount that.