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chuck2003, using your heat gun, start with the wings of the heel cup and once they come away, work your way to the sole. If you can get the whole heel cup off, it is easier to re-wire the shoe as you will have access to the bottom port hole as well as the top one. Where are you putting your battery?
With the last pair I did, I left the upper attached to one side (I choose the lights side) and lifted the upper completely off the rest of the sole. So basically from the front rib right around to the back rib leaving just that section attached.
Once you can access the base of the toe, gently peel the cloth away from the pink card board. DO NOT tear this away. You NEED it to reform the toe. ONLY peel the toe leaving the rest of the under wrap still attached to the pink card.
Unpick the stitching on the toe ONLY and then carefully peel open the layers. You may need a bit of heat to soften the toe box. Once you have that opened up, you can cut the toe box out leaving the top and base layer.
You then tuck the tow layers over the edge of the pink card and glue it back in place. START at the part that is still bonded to the sole so you don't get a wrinkle.
You can pack a nice bead in under the upper, then after that has set, go back and fill in the seam. Do it in stages. Take you time.
My video showing what NOT to do is up on YouTube now.
Since this video was uploaded, I have pulled apart my US8s again to correct them. They are still not perfect, but way better than they look inn this video. I will make another update soon as I get closer to fitting the soles.