Dont worry, theres always something new to learn.
I’d do it the exact same way. as if you cast to your book blueprint it will only affect the book, regardless of where its placed. unless you mean as a component of the bookshelf, then we need to look at a completely different method 
In the way i have described above if would work like Oblivion/Skyrim where you can point at a specific book on the shelf, with each book being its own unique object(in theory you could pickup and move each around independant of the shelf etc)