Wow, I have never thought that whilst studying business administration I would find something that describes so well what I have been doing several times in my life.
You should never elaborate a plan in too much detail. It costs energy, and you focus your energy on thinking about what could go wrong, and that’s a waste. It often takes a lot of effort to prevent people from putting in too much energy at the beginning of a process by thinking it over meticulously. It only creates false certainty, because once you begin to make some progress, you realize that you are often in a different place than you thought you would be.
Better study further pragmatic strategy.