The secret to making plans that never go awry is this: set up your plans so that if it looks like something is starting to go wrong, you can change them. It's not so much a matter of planning as it is one of attitude.
Weirdly, this ties directly in with some of my earlier thoughts on impermanence and balance. Sometimes, event have a kind of flow to them, and pushing against the flow just won't work... but getting out of the way, and coming at it from the side? That works just fine.