Using the curved pins, there are cheap and expensive ones. I have found the more e xpensive pins have a better point and tend not to leave such large holes. Always start in the centre and work outwards. The one point no one has mentioned is making the sandwich. Put the right side of backing on the flat surface you are using. And tape down with a little tension then place the wadding on top laying if flat without stretching use fingers only. Now put top on right side up. Again lat flat with fingers and pin from centre. Keeping flat pin every 6 inches. You will use a great deal of pins. Back and wadding should be larger than top on all sides. PM is need more advice on this as it is important not to get wrinkles in back.