On those tricky stars with all the points coming together in the center; you would avoid quilting in that specific area. Also, when you are assembling blocks that all come together in the center area like some stars--you don't sew all the way to the end. You sew up to the 1/4" from that intersecting point and back stitch. On the final seam when assembling the 2 halves, you sew all the way across/down. When you press out your blocks before assembling into rows--you may even have to press some seams open and I've even had to hammer some of them flatter like you do for rolled seams in denim.