I use starch and an iron to press my seams under. Then I glue baste my pieces on to the background. It takes a bit of time but I love the results. All of my curves and points are perfect. All I have to do is get comfy and sit on the couch and sew. I don't have to worry about turning anything under. Its perfect with the kids and I have to set my work down at any give point. My favorite blog describing this technique is
http://erinrussek.typepad.com/. Its great and her designs are super cute.