To insulate your ceiling, you’ll need insulation, vapor barrier, duct tape, staples, nails, measuring tape, utility knife, staple gun, and a drill. Install the vapor barrier first, ensuring it’s taut and sealed with tape. Cut insulation to fit snugly between joists and secure it using staples or nails. Seal any gaps with duct tape to prevent energy loss. Finally, trim excess insulation around light fixtures for safety.