Darin, if you HAFTA blow it into the walls, its usually easiest to cut out a strip all the way across the exterior walls. However, on older homes like this, the main problem isnt always from the lack of insulation. Youd probably do better by first checking and sealing around doors, windows, electrical outlets, etc, cuz thats where the cold air penetrates. Take a few of the cover plates off the electrical outlets and see if you feel any draft through them (Youd be surprised at how much they matter
). If everything is sealed well and all else seems fine, THEN Id start thinkin about cutting the walls open and insulating them. Hope this helps
