I use a domestic machine. I stitch in the ditch rows and blocks first. I use Bottomline thread by Superior on the top and a thread that matches the back in a 50 or 60 weight on the back. This secures the entire quilt. Then, I go back and quilt the individual blocks. After I stitch in the ditch around the borders I stitch 1/4 inch from the edge of the quilt all the way around making sure I hold it square with the machine so there is no 'creep'. I think this is a most important step and perhaps the most difficult. I trim and square my quilt at this point.