What this is: A seven week self-guided course that requires doing about 30-60 minutes a day of reading and writing and exercises every morning.
Who should do it: people who've done years of trauma therapy already but are struggling to find either a (good) partner or friends (this doesn't need to be romantic), or people without a real trauma/abusive relationship history.
I just completed this course over the suggested seven weeks. Overall, this is a wonderful course, and I really had fun with it. I didn't allow myself to look ahead, and doing a different thing first thing in the morning each day felt like a therapy advent calendar! I also think it genuinely did change my life. I did it more for friends than a romantic partner, and the material is really applicable for both, so I did it for both. Despite that it says it takes 20-30 minutes a day, the shortest day was 20min and several were over an hour.
There are two main things, though, that I think you should know before reading/doing this:
1) This book isn't accurately advertised. For those of you who have done prior trauma therapy reading, this is effectively a Stage 3 (by Herman) trauma therapy book. If you have a history of abusive relationships or had abusive parents and you read this book before doing any therapy, it might actually hurt you more than help. Stage 1 is when you start going to therapy, leave abusive relationships, learn how to cope in healthy ways with your trauma, and stay safe. Stage 2 is where you delve deeply into your past experiences of trauma. Stage 3 is the final stage where you learn how to be in healthy conflict with others and reintegrate into community. If you had abusive parents or have had a string of abusive relationships and have never gone to therapy, I'd recommend a book like "Toxic Parents" instead, not this one. If you have done that work previously, though, then this book will basically tell you what you need to do and learn now, which is really helpful!
2) The basic premise of this book is that if you have been single (or friendless) for a long time, then on some level you actually don't really want a partner/friends The book then helps you explore all the things holding you back from actually wanting/going after what you think you want. It is, however, difficult to say "accept responsibility for all your problems" to someone without victim blaming them, and I do think there are moments here where the author does some victim blame-y stuff, and you need to be ready to just brush off some of her words. In other instances too, sometimes you need to translate what she says a bit, including her mentions of "God" if you're an atheist.
So if you either don't have much history of trauma and abuse, or you have done lots of work on your history of trauma and abuse, then I recommend this book. It's really helpful for improving your capacity to be loving and happy while still maintaining boundaries.