Does anyone have the same problem with the Pfaff sewing machine presser foot lever? It has a special position for free motion quilting which is halfway between raised and fully down for straight stitching. It's really hard to tell the difference and I can't tell you the number of times I've set off free motion quilting with the foot up - result is a spaghetti mess of thread on the back and lots of unpicking.. by the end I'm totally tense and frazzled and the quilting is dreadful. (Hand quilting is so relaxing in comparison!)
But - I will keep trying!