Using soldering iron to remove old battery ribbon cable
Rather then use a simple push-on clip or ribbon cable with pinching connector, Apple has chosen to solder the ribbon cable from the battery to the motherboard. And not with two simple, well-separated connectors, but three very close connections. (Note: If any two touch, your iPod Touch can short circuit and be toast).
Once the solder was cool, a quick press of the power button confirmed all was working as the Apple logo appeared. From this point the rebuild went rather quickly: battery to back of metal frame, frame's eight screws in place, touch-screen ribbon cable to motherboard connection. You then press the touch screen back into place, and you're good to go.