If you're rehauling the springs by yourself, I warmly suggest to avoid weird processes, like doing the work inside a bag, letting the spring go, or hanging the spring to the ceiling etc. All you need is a table that can be cleaned with gasoline when the work is done. Always hold the spring and barrel firmly: you shall control the spring, and not allow the spring to take over. Remember, before attempting to remove the barrel, that the spring shall be fully unwounded with absolutely no force applied to the gears, otherwise you risk to destroy the gears themselves and injury your hands.
There goes the unwinding of the spring. I assume by your nickname that you're a woman. The only thing that I'm not sure a woman could do is to re-engage the spring to the rivet inside the barrel and wind the first turns. In some cases it took all of my strength to do it, and I'm definitely not a wuss. When you plan to reinstall the spring, perhaps you should keep a man "at your fingertips", just in case everything else fails.
