This video shows how my FatherInLaw and I replaced a crawlspace hatch with a full staircase to an unfinished basement.
Products:
Rigid Table saw
https://amzn.to/3H9HrD7
Ryobi Drill and driver
https://amzn.to/3Il4vyO
Ryobi 10" sliding compound miter saw
https://amzn.to/3rED4Jr
Ryobi 18V finish nailer
https://amzn.to/3nQyN4G
Disclaimer: These are affiliate links and I will get a small percentage if you purchase these items.