Too get the shapes to be exact size trace the design on steam a seam lite. Draw on the side with the print your using and cut with what you will be turning under as you sew. If it has a circle shape make little clips close to the line you drew so you can do it easier. Don't cut too far ahead. Make sure you have a good pair of pointed scissors like the ones with a crane look. Sometimes if the edge don't want to do what you want it to do a good glue stick for fabric is helpful. To practice a heart shape is a good place to start.