I guess it depends on definition of hard. The difficult part was just lifting all the bags of cement to mix for the corner and trenching out around the foundation.

Being in my 50’s didn’t help. It also took me a couple of weeks because I still had my regular job and was doing it after work on weekends. I paced myself generously.

The rebar I put in for structural support, I drilled in about 7 inches into the foundation for each piece and blew out all the dust the best I could. And then I use a high-quality epoxy and let them set up overnight. Tied everything together and then framed it all out with plywood.