I love th Discovering Doctrine study! It really puts focus into Bible reading. I’ve started doing it on my own so that when I start my daughter in the fall I can help guide her from my own experience.
Here is an old thread I found that describes how to use it: http://simplycharlottemason.com/scmforum/topic/your-experience-w-discovering-doctrine
Also, I’ve found that personally I don’t always have the time to add the entry right when I find it. So, I’ve put a post-it note on the first page of every doctrine. I can jot down the scripture verse on the post-it and when I have time I can write it in my book. Then I just cross off the verse on the post-it note.
Just thought I would share!