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Once the attic opening is clear and supported, remove the blue painter's tape from the ceiling around the hole. Next, install the decorative wooden trim around the perimeter of the opening. The trim pieces used are typically 2.5 inches (6.35 cm) wide and should be pre-cut with 45-degree mitered corners for a seamless joint. These cuts can often be made at the hardware store using their miter box and saw in the trim aisle. To determine the correct length for each trim piece, first measure the length of the hole itself, then add 2.75 inches (about 7 cm) to that measurement for each piece. This accounts for the mitered corners and overhang. Begin by nailing the first trim piece into place, ensuring it is perfectly aligned and straight. This piece will serve as a guide for the remaining pieces. Use a pneumatic nail gun for efficient and secure attachment, ensuring that the trim is nailed into the underlying ceiling joists or the newly installed bracing. To correctly position the third trim piece, temporarily install the fourth piece and hold it in place. This will help you align the third piece accurately. Nail the third piece into position. Finally, nail in the fourth and final trim piece. The finished trim creates a clean and professional frame for the attic access.