Don’t fool yourself that you can plan an entire project in advance and nothing will go wrong. A lot of things will. And that’s why you need that idea, vision or direction. Because when you get pulled over, it’s easy to deviate and change course. So in that case you start increasing time, money, more people and so on. Don’t believe in blueprints. There is none. Just be ready that things will go wrong and stay laser focused on your vision and project.