What I think, not what I thought
Most importantly, however, when you make it up as you go, you get to do what you think, not what you thought. All plans are rooted in the past — they're never what you think right now, they're what you thought back then. And at best, they're merely guesses about the future. I know a whole lot more about today, today, than I did three months ago. Why not take advantage of that reality?