Sweet job. I have found when pinning to quilt make sure your fabric is ironed free of wrinkles and use a flat surface you can tape the first slice of the sandwich down to will help keep it wrinkle free. Also starting in the center and pinning to the outside edges in a + manor helps, as it allows you to smooth it a little more.Can usually get away with pins 1 1/2 to 2" apart. Larger Quilting pins give a little more leeway. Keep up the good work.