The main thing (After you get the proper foot) is the speed of your hands as they move the fabric & the speed you run your machine. If your hands move too fast, the stitches will be big & vice versa. That is the hardest thing for me to get coordinated! I start out good then slow down with my foot. Have even tried using the speed control on the machine instead of the foot control but, yes, as everyone said ....practice, practice, practice!!!