You will need two people for this step.
How to install attic access ladder.
In this video this old house general contractor tom silva explains how to install attic stairs.
Cut out attic access opening.
The foot gets attached with a bolt and lock nut.
Use a reciprocating saw to cut joists and nails holding any joists that must be removed.
Extend ladder to the floor and add adjustable feet.
One person should be in the attic and one person should be on the lower floor.
Mark the holes on each side drill em out and attach the feet with the provided bolts and lock nuts.
Snap chalk lines onto the ceiling to represent the rough opening of the attic staircase.
Slide the foot over the ladder rail and check that each foot is flush with the floor.
To finish your project get some spray foam and insulate the gap between the joists and the ladder frame.
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Ensure the hinge side is on the correct end.
Drill holes through foot and ladder rail and secure with the bolts provided.
Extend the ladder fully and drill for the feet.
Leading with the hinge side of the ladder lift the ladder assembly up into the opening using the temporary support boards as a guide.
While the cost of doing this work yourself reduces the cost of the project from about 650 to 220 a professional licensed contractor should complete the job from needing a second set of hands to making structural changes and modifying existing piping wiring and air ducts this work is full of potential pitfalls and requires specialized.