No, too much risk in doing it wrong. Plus you'd have to restrain them somehow, which is frightening to them. Much more frightening than just putting them in a container and letting them go to sleep.
I use a co2 chamber. I used to go the dry ice route, but it's banned where I live. Dumb college students making bombs out of it and whatnot. It's much more expensive to buy dry ice every time you need it than just constructing a chamber.
The co2 container
http://www.amazon.com/Pure-Energy-40...7&keywords=co2
Remote coil (you can just get some tubing and a valve and do it yourself for much cheaper, but I'm not handy so I bought one of these)
http://www.amazon.com/UFD-Coiled-Rem...ds=remote+coil
Get a small sterilite container for the chamber, some small aquarium tubing and a plastic container filled with water for the oxygen escape, and you have yourself a great humane way to euthanize that will last.
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