I know this is a late reply, but this is the first I've heard of Writing Blueprint, and if you did end of trying it, I'm curious as to your experience.
I admit I'm a bit skeptical. Sites that purport to have a golden formula for writing a book feel a bit like ads for weight-loss programs to me--promising a lot but often delivering something mildly helpful at best. (Not saying Writing Blueprints is unhelpful; just that it's my default reaction to programs like it with no additional information or experience.)
If you decided not to try it, I'm curious to hear what led to that decision, if you're up for sharing.