I like to use the Freezer Paper ironed onto the wrong side of my fabric. I trim the fabric about 1/4 inch from the edge of the design and pin to my quilt top. I then needle turn under the paper and invisible stitch the applique on. I can then either remove the paper when I am almost done stitching or cut a small slip in the back of the applique and pull out the paper that way. Fusible is fine as long as it is the lighter weight. Otherwise it makes the design stiff.