to start with wunder under is going to be toooo stiff, you want steam a seam 2 LITE or fabri fuse LITE. these are paper backed fusibles, easy to sew and you can hardly tell its there. wunder under will feel like an iron on blue jean patch! draw your design on the paper side of the s.a.s, cut out roughly, iron to the WRONG side of your fabric then cut it out right on the line, remove the paper and place it on your background, make sure you have it where you want it before you iron it to your fabric. you need a teflon pressing sheet or at least some wax paper to be sure you don't get the fusible on your iron. good luck