Thanks everyone. We borrowed a hand truck. I was the guide on top pulling and my (2) boys pushed and lifted. Took us 7 minutes from the bottom to the top. Going over every step one by one. The transition in the middle was the toughest part. I was was sweating and so was my eldest. My youngest one didn’t even look tired
All was safe. No pun intended. The safe, stairs and drywall all good
Thanks again for all the tips!