Andrea-I think your plan sounds good! You can always start with the most important books and just see how many you are able to get through this year.
I have more thoughts on using “high school level” books that I thought I’d share. When I was in school, I thrived on literature. I made all A’s in English and was in English Honors classes in high school. However, I despised history. The textbooks were “high school level” but they were dry as dust. I made good grades but my history knowledge was abysmal.
Fast forward to years later when I began homeschooling my own children. I learned about Charlotte Mason’s methods and started reading living books for history. As I read books like the D’Aulaires’ biographies and Landmark biographies I began to realize that I didn’t hate history at all! In fact I love history! It quickly became my favorite subject and still is today, 13 years later.
My point in sharing all of this is to say that reading “high school level” books may not be nearly as beneficial as reading interesting, living books that appeal to the reader. Charlotte Mason said that students should enjoy their books and I agree with her.
On that note, I am more than fine with including some easier reading books in a high school history course. Most, true living books are worthy of being read over and over again by people of any and every age. Some books are written down to the child but those are not the type of books that Charlotte Mason ever recommended. I enjoyed Bambi and Swiss Family Robinson and Columbus and Buffalo Bill and as much at 21 as I would have at 6. They are timeless and cross age barriers.
All of that said, I do make sure to include books in our curriculum that challenge my children. I just don’t think that every, single book they read needs to challenge them on every, single level. Sometimes, the information contained in a book, and the style with which it is conveyed, is more important than the level of the book.
Of course, all of this is just my opinion and you know what they say about those. 😀