Hint: The 'start' for everybody is the moment of conception is when they take their last breath. There is hindsight and that can be very helpful, or a curse. How many times have you personally hit reverse and it 'worked' to any degree, let alone 'successfully'.
The closest it came for me is was 'group' during the final stages of a bad marriage. There was a lot more back-tracking but all the events remained as they were when they first happened. The 'change' is using the group to 'imagine' how an adult version of your child would handle the situation'. The 'role-playing' was supposed to help the people in the group from reacting to a similar situation today like they did when they were 3 (or whatever).
That makes your 'new reaction' something that has only to do with the person in front of you rather than there goes the rest of the evening, and then some in most cases. For me, being silent when I had something to say on the subject was caused by anxiety. That is a work in progress, down to hours rather than days or never. Facts are pretty emotionless, for me, I'm sure they make a few people here squirm. Do I care, nooo. (not at the moment, hazards of trying to live in the moment by being spontaneous to what I am reading) I'm no doubt disadvantaged in a few ways, most of you people are hopelessly trapped.