I only read "When Children love to Learn" and that was enough to learn the basics of CM. Very simply, I try to either read aloud to my kids or have the older ones read to themselves, then they re-tell or 'narrate' as Charlotte Mason calls it-back to me what they read. My kids are 7-14 and I have 4. Two of my kids are attention deficit and it really helps their reading comprehension. I'm careful to get books I know they will like and go over any difficult vocabulary before I read it. Otherwise, it's a great method. But I do not agree with CM method for teaching kids how to read by sight-I've found phonics works very well. Anyway, it's simple to incorporate into hs and for me, the less stress the better since this is my first year hs all four of my kids!
Have a great day!