Feras Alhlou explains why your plans will inevitably break. He references Eisenhower and Mike Tyson to argue that planning matters, but execution, iteration, and learning matter more. The point: act anyway, adjust as you go.
You have to do some planning and then execute and then iterate on that and realign, learn from others and learn from your own experience. And as Eisenhower said, planning is everything and the plan is nothing. I think Tyson said that too, Mike Tyson. After that first punch, the whole fight plan is gone. So put some plan, a lot of planning is important, but then you gotta put it into action.
