I use my open toe embroidery foot on my Pfaff 2030, and try to stay on the "low side" of the seam, that is not the side with the seam allowance. Like anything else, practice, practice! I'm actually pretty good at it now, after about 10 years of practice...lol. I also do alot of quilting on the diagonal with blue painters tape, you stitch along the side, but not on the tape...takes tweesers to remove stitched on tape.
Sue