Don't get me wrong, I totally understand the idea of climbing a pitch clean from top to bottom and the pure satisfaction that it brings, but for me, a weekend warrior,(at best) who gives a fuck if you hang on the rope!! Are you posing for a mag?? Are you looking to impress your co-workers?...If not, then just go out and climb.
I agree with J_B, leave the book at home, you'll climb better, faster, stronger if your mind isn't secrcetly thinking about the grade. It doesn't work for me, but maybe it will for you.