Starting: pull the bottom to the top, use tiny stitch length about 4 stitches, then proceed. It this doesn't seem to be holding, I'll tie the top to bottom thread then with a needle bury it into the sandwich until the knot pops between the fabrics.
Stopping: 4 tiny stitches, pull the bottom to the top and leave 6-8", test for durability, if necessary tie off and bury.