Back when I was working full-time, I was a law librarian, but now that my youngest is in kindergarten and I'm making choices about this next chapter, one of the pivots I'm considering is school librarianship. Basically, I used to be pretentious, but now I find myself wondering, "Wait a minute, someone would pay me to hang out in a room full of books, think bookish thoughts, buy fabulous books I don't have to spend my own money on, and spend my days helping kids realize books are amazing?" It definitely has its perks.
I can't talk about how effectively this book prepares someone to work in a school library, since I haven't actually worked in that setting, but I will say that it gave me loads of relevant information about things I'd need to consider about how I would navigate working in that setting. I recommend!