To save money I'm going to go in and insulate some areas of the house myself, I'm talking basic stuff like taking foam insulation and shooting around windows where air can infiltrate. Once they get the electrical in I'll also go in and insulate around the outlets. Any other ideas/tips/hints? My main concern is the bay windows, I notice that in some areas there is no sheathing due to angle etc just tyvek so I was going to use the foam there. The bay windows are not one piece.