Certainly applying heat will help you get the wires out, but it may be unnecessary. I had 10 or more wires around the bulkhead/ hatch stiffener area which refused to budge so I just snipped them flush and sanded them smooth. Of course this leaves an 18 gauge dot of copper visible through the fiberglass, but I find this no more visually detracting than all those dark colored stitch holes which are equally visible.