My advice is to keep it simple and ignore all the extremist jackasses on these forums. You'll spot 'em easily enough. Here's a diagram to help you out:
Seriously, though, stick by that and you'll be doing well. Being Primal isn't hard. Faffing about with it every week because you want to tweak will lengthen your journey. Get the basics of it down (by reading the book) and then worry about little alterations to it. Understand, apply, observe results, make adjustments. Rinse, repeat, feel and look awesome.
Oh, and start a journal on here. You'll be glad you did.