Unfortunately, I ended up hurting my back 6 days into the project while intalling the shingles at the top back of the house. The rest of the roof was completed by my father, my brother Jean-François, Luc, Troy, Gaëtane, and my mom. Since I couldn't lift anything heavy, I ended up helping with just small jobs for the rest of the week.
Note that the roof had no plywood -- only 1x2" slats. The first part of the job after removing the old pine shakes was to install 7/16" OSB over the entire roof.
The first few days proved to be extremely hot, with temperatures around 40 Celcius. You can see what happens when a group of people are working up on a roof for several hours in this temperature: