This book is very impressive, and I have found it extremely useful. I homeschool my children in English, as we live in Europe and they go to school in another European language. With the help of this book's comprehensive presentation of the resources available by subject and age, I found the writing course I teach my children from. I also found great critical thinking materials. She gives a guide to materials in each subject for each year.
Susan Bauer's homeschooling programme is very ambitious. It would yield a far, far better education than almost any school. However, I think it's possible. It wouldn't require expertise, because there are resources available (some better than others), and she covers the field and points you very specifically to the ones she likes; but it would be most of a very demanding full-time job and require self-discipline and commitment. However, it's possible to take aspects of her approach and apply them. This is what I've done.
I also got an incredibly useful insight from this book, which transformed my understanding of my children's learning processes. She presents a child's education as a succession of three developmental stages: first, up to age 11, when children absorb data, lots of it, and are learning to reason from the particular to the general (which is intuitive and easy); second, age 11-c. 14, when they should be taught to manipulate what they've learned and to analyse, play with structure, in other words to think down from the general to the particular (which is much harder, and which they aren't capable of when younger); and third, age c. 14 upwards, when they learn to manipulate arguments, to write, to persuade, to write from a point of view. I think this is absolutely, totally right. Perhaps all teachers know this; but I've never heard anyone say it before. Thinking like this made my teaching massively more productive and effective, and allowed me to focus much better.
My children are too old for it now, but if they were younger, I would use this author's writing course, The Complete Writer: Writing with Ease. It's superb. She is really tough, and it would really, really work.