X3 on two Thermacells!!!!! I hunted New Brunswick this spring, I used both when I first climbed into the stand, then when the skeeters thinned out I shut one off, and saved it until later. Clothing wise I wore long johns under my wool pants, long sleeve t-shirt, button up flannel shirt with a fleese jacket, with an extra in my pack just in case it got colder at night. I hunted the first week of June, and was comfortable with this, also a rainsuit just in case. Something else to consider is some black latex gloves, the skeeters can't get to you through them!!! Not sure about where you're staying but where I was at we had all meals cooked for us, we had to bring towels, and bath stuff, and blankets for the beds. I also bought Shannon Bug Tamer head nets for me and my wife, they worked great!!! They cover your neck well, and you can either have it down over your face or roll it up to have a clear view, with the Thermacell running I was able to leave mine rolled up so as to not interfere with being able to draw my bow and shoot. Good luck with your trip!!!
Jason