The idiom “see the forest for the trees” means seeing the big picture without getting bogged down in the details.
But details are important because they give the narrative flavor.
The matter at hand is how to incorporate detail without letting the infrastructure of the story crumble or even shake.
The answer is prewriting.
In prewriting, we formulate a plan, often a diagram to hold the supporting details as they buoy up the main ideas we wish to communicate.
The trees thereby come to make up the forest.