I’ve been using a dab of Elmers School Glue on the back and on floppy pieces, like flower petals. It’s important to not get it too close to the edge as it’s a little harder to get the needle through it. Previously I’ve used Roxanne’s glue, can’t remember the exact name; it has a pin point tip to just make a tiny dot of glue. I let the Elmers glue dry overnight. The Roxannes glue dries pretty quickly. My instructionx say to use something like Steam A Seam, but my arthritic fingers can’t handle the extra pushing needed for stitching. I mark the shape then iron freezer paper to the wool to cut out the pieces. As for positioning, I eye ball it. If I need to stay within a certain parameter, like 8x8, I mark those edges. I love working with wool applique.