I'd like a slice or two of endurance as well.
First let me say your garage is coming along awesome, I am a bit jealous.
At 68 I still try to do as many projects by myself as I can. Although they are now much smaller in scope than your garage. I also have a great neighbor who is always willing to help and I return the favor whenever possible.
Having good people to work with is always a plus and can be a great learning experience.
Enjoy the process and I am sure you will enjoy your new garage when done.
Luther