I've got 4 Pedestals and 4 books. The books are On Apocrypha: boneless limbs, On Apocrypha: Delving Pincers, On Apocrypha: Gnashing Blades, On Apocrypha: Prying Orbs. I don't know what the hell to do can some one please help?

If you are talking about the point in the main quest when you have to place four things on four different pedestals, then you need to match the title of the books with the pictures on the pedestals. For instance, for the book On Apocrypha: Boneless Limbs, you should look for the pedestal that has a picture of tentacles somewhere on the pedestal. Hope that helps!