I read the book, did the confrontation and now have been totally cut off from my whole family, siblings included.
The reason I did it was that I was going through a breakdown (well not total breakdown but horrendous panic attacks almost constantly) after a VERY hard few years so was forced into therapy. We looked at my childhood and the shockingly low view I held of myself, I had no intention of confronting my mother about it until a few incidents involving my DC happened - them being ignored in favour of siblings DC, them being called names by my mother/stepfather, DD telling me my stepfather had smacked her one.....
Then the rage hit (and post natal protective hormones as DC4 was only 4 months old when I did it!) I confronted by email copying in siblings as I misguidedly thought they may see things from my point of view (what with me always having been the black sheep) and offer support, of course that would never have happened as I was the scapegoat. It was a well worded email, not accusatory, more just WTAF! I left a lot out like my sexual abuse which my mother knew about and blamed me for and focused on her horrendous emotional abuse which was mainly due to my similarity to my father and his family who she hated.
Shit hit the fan big time. I was threatened with violence by an older brother, 'how dare I upset our mum after all she's done for us'. Tried to talk it through with my mother as I had also recently got back in contact with my absent father after over 30 years and I wanted her side of some of the things he'd told me. We had a last face to face meeting 18 months ago, which she stormed out of when I told her that after refusing to speak to me for over 6 months meaning that I was dis invited to two siblings weddings and turning the whole family against me, I was not just going to let her have free access to my DC, which was all she wanted. She was never interested in me, her own daughter.
Whole family have now disowned me and it fucking hurts, so much. They were never supportive, made me feel good about myself, helped out etc but I still loved them in spite of it all.
NC is always a possibility after a confrontation and that is fine if it's what you want, but when it's turned onto you, and you are made out to be the bad guy, it can be shattering. I would advise to be aware that that is what can happen.
Too right that knowing they have hurt you can give them power over you. My mother knew how being cut off from everybody would cause me great pain, that's why she did it.
If I had my time again, I would have confronted them in a more drawn out way by calling them on every single nasty thing they did and said and just withdrawn slowly and to my timeline.