Hi, we live in an old rented house, it is cold! I am wondering about putting thermal linings on the curtains, they are roman blinds and are just single layer cream cotton, but are HUGE - do you reckon I would be able to do this myself? Can't see landlord being willing to do it but put off by possible complexity and cost!Any other ideas for adding extra insulation to old, high ceilinged, original floorboarded type house?? Thanks!