When I first attach my binding to the quilt, if I am going to finish by hand I simply sew my binding to the quilt top side, matching up raw edges and using a 1/4 allowance stopping 1/4" from each corner so I can miter my corners. I don't use pins or anything at this stage. When I go to hand sew it to the back I use hair clips to hold it in place.
If I am machine stitching my binding 100%, I stitch my binding to the quilt back side, again matching up raw edges and using a 1/4 allowance, mitering corners and I don't pin. Then I bring it around to the front and stitch as close as possible to the folded edge. I don't use clips or anything for that either.
However, when I was a newb, I did pin my binding when machine stitching the first pass. Up until recently all my bindings were finished by hand. I just didn't like the look of machine stitched binding. I am still not crazy about it and have tried various techniques like SITD from the front, glueing, etc. I am usually never pleased with the result so I will stick to hand stitching it with few exceptions.