Just like FMQ this is one foot that you have to practice with. You are putting 3 layers in the center that you need to keep straight (maybe doing a narrow zig-zag would help) and then trying to feed another piece of fabric into the binding slots and keep that straight also.... I never put my binding on with this type of binding. It is much easier to fold in 1/2, sew raw edges to the quilt raw edge, fold over and stitch down. I start on the front and machine stitch to the back by stitching in the ditch on the front. Much easier to control..