Make sure that your sandwich is real taut without being overstretched. Then pin at least hand-width apart. (When I pin, I make sure not to put pins in my sewing line.) I also use a walking foot for SID. Roll your quilt toward the middle and start at the outer edge of one of the center lines. Then work outward from that line. Roll the opposite side and repeat in the other direction. I like to do my SID with monofilament thread - nobody notices when I fall off the ditch.

I'm quilting a Warm Wishes now on my DSM. Have finished the body of the quilt, in fact, and lack only the outer border. I stitched in the ditch where the seams join. Not hard, just meticulous, staying in the ditch. Then I used a meander or snake like stitch down the center of each focus print and joined strips.....if that makes sense, so that the quilting is about two inches apart in all directions. (the batting instructions were for 2 to 4 inches). I did consider cross hatching the entire quilt, though, and think that would look okay, too, if you prefer it.

Yes, this is what I find the most difficult part. Wrestling that quilt around is a workout sometimes!