A few things we did that I know helped our stress level: I rented a Port-O-Toilet that stayed on the job site for the length of the project, I had my wife deliver coffee and donuts a number of times, and during the warm months I left ice and Gatorade in a large cooler every morning. How did that help OUR stress level? Happy workers that had no problem fixing mistakes that we came across, that's how.
I realize that being 85 miles away complicates things, but putting in a little extra along these lines will help YOU get through this...