You can do it! And it sounds like you have a great therapist, who is able to help monitor your distress levels to keep you from being re-traumatized. It is not an easy decision to make, and I'm proud of you for deciding. Some people go their whole lives without talking about it and never feel that relief of having a witness to your turmoil. Take it as slow as you need to, be gentle on yourself, and try and do something soothing for yourself everyday, whether it's a special hot drink, a bubble bath, meditation, or anything that makes you feel special. After all, you're doing it for the hurt part inside you, to help them know that they are safe, loved and okay exactly as they are.
all the best
IJ