In this video

With the opening prepared, the new, pre-assembled attic ladder unit is brought to the site. The worker carefully lifts the entire folded ladder assembly, which is integrated into a wooden frame, and maneuvers it into the cleared ceiling opening. This requires precise alignment with the ceiling joists. Once positioned, he uses a Ryobi nail gun to securely fasten the ladder's wooden frame to the surrounding ceiling joists. This step ensures the ladder is stably mounted, level, and square within the opening, which is crucial for safe and smooth operation. Shims may be used, though not explicitly shown, to achieve a perfectly level and tight fit.