I cut my GFG hexagons out of freezer paper and iron it onto the back of my fabric. There's no problem getting the needle through it. I trim the fabric to within 1/4" of the paper, fold over the edges, and baste around it. The paper won't slip because it's adhered to the fabric. Once I've stitched my hexagons together and removed the basting thread, it's no problem to pull out the paper on the back.