I press my backing the same as SherylM. I prewash all my fabric and I press it the same way: fold it half matching salvages press on one side, turn it over and press the other side being careful to press in the direction of the length of grain and not pressing the center fold. Then I open it up and press the center. I iron in the kitchen and use my kitchen table butted up against my ironing board to keep the fabric from hitting the floor and getting rewrinkled (new word).