Properly placing recessed cans in the ceiling is crucial to avoid issues during the drywall installation process. Using cardboard templates to map out the placement of the cans can help ensure they fit correctly between the joists and do not interfere with other elements in the ceiling, such as duct work or plumbing. Additionally, in areas like Chicago where metal conduit is used for electrical wiring, careful planning is required to ensure all components are in place before running the conduit. Overall, accuracy is key when it comes to installing recessed lighting, and taking the time to lay out the placement correctly with templates can save time and hassle in the long run.