Well, I’ll chime in but I would love to hear from others too. 🙂
Ours is more of a guided affair at the moment. My 12yo (13 this week!) brings it with her when we do our school Bible reading or Family Bible reading. If we discover a doctrinal truth during that reading, she adds it to the book right then.
Eventually I want her to feel confident enough to add truths from her personal reading times, but we’re easing into that stage.