I've been using BFSU for a few years, and I've found it easy to implement. I use the kindle version of the book, which I find much easier to navigate (2 taps to get to the flow chart, or any lesson in the book). I read and maybe highlight, but I don't script the lesson. I just explain it and do the demonstrations. If I lose my train of thought, or want to make sure the kids understood the lesson, I go to the list of discussion questions at the end of the lesson. I used to use the recommended books and look up YouTube videos, but I found them to be mostly redundant, and they made the lesson longer than was comfortable for small kids. With just brief lessons with the recommended demonstrations, I found that the kids remembered the material and integrated each lesson with other concepts, even over long periods of time.
So I am just reading the lesson content on my own and narrating it to my kids, like they do with their own reading.
That said, curriculum is nothing more than a tool, and if it's not a useful tool for you, you should definitely move on without any guilt. There are so many good resources out there.
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