"Over Prepare, then go with the Flow".
That is what I do. It can also mean a lot of different things. One person might have several elaborately detailed contingency plans, someone else might distill the process down to a few core aspects which can be easily reapplied and adapted based on changing circumstances. I tend towards the later of the two. It could also be motivated by the love of designing the perfect plan or by a desire to get the planning aspect out of the way in order to enjoy the flow. Who knows.