The more you plan, the more you realize that there's basically an unlimited amount of things to plan.
The more you realize that there are so many things to take into account that it will probably never ever work out just fine.
And the more you realize all of these things that could go wrong, the less likely it is that you're ever going to take action.
And the more likely it is that you're going to end up planning some more.
So that in the end you have no energy, time and resources left for the only thing that really matters...
Doing...