Crown molding can be intimidating, because walls often aren&#x27;t flat and nailing is difficult. Don&#x27;t worry. This three-piece system solves those problems. Here we&#x27;ll show you how to install trim on the walls and ceiling first, then add the crown. The three combined look elegant and go up more easily than a single large piece. We&#x27;ll also walk you through the tricky cuts at corners.