So, I've decided I need to do some Calculus reviewing since I haven't been in a Calc class since last fall, and I'm taking multivariate Calculus this fall. I own a copy of Spivak's calculus, and I know it's supposed to be a challenging math text, but I want to at least try my luck with it. There's nothing at stake. Any recommendations on how to approach this book? I'm a little intimidated.