I don't pin when sewing the binding onto the quilt. I pin the fold (double fold binding)to the back when hand stitching the back edge down. I like to pin the binding to the back by weaving my flat head pins along the binding edge, being careful to bury the point into the sandwich. I also try to do them all in the same direction so that the points are facing away from myself as I hand sew. Weaving the full length of the pin helps to not to get stuck and keeps the loose thread from getting hung up on pins sticking out. I have tried the hair clips but they don't seem to hold the binding they I want it for hand sewing.