When I first started, I traced around some thing round,like a coin, or depending on the size a cup etc. on freezer paper put that on the back of my fabric, when cutting leave seam to be turned under,,spray some canned starch in a small container,it will turn liquid, use a small brush or something like that ,while damp or wet use a toothpick and pull the seam to the freezer paper and press til dry, take off the fp turn and place where you want it.check and be sure the curve is as you want it. Now I can just needle turn just very small area and keep it smooth. Hope this makes sense to you let me know