When I made my Dresdan plate I cut the center circle larger than the opening and I used a piece of thin cardboard for a shaper, I then ironed around it with about a quarter inch turned back to make a good circle. then I pinned it over the plate and basted it with very tiny stitches. The same went for putting the plate on the muslin. I cut the back of the plate out to make it easier to quilt. It's important to iron the plate real well first to get the shape correct.(I've seen some where they are not circular and somewhat pointy). I pinned mine to the muslin but you could use the spray adhesive or the glue stick for that. The stitches should be tiny catching only a thread of the back and the plate. You will have to cut the curves with small slices almost to the edge to get it lay down correctly. You may want to try a sample first to master the technique. It's a beautiful pattern and I'm sure you'll do it justice.