Quote Originally Posted by satomi325 View Post
X2!!

I agree fully with this.

I would advise against cervical dislocation, especially if you're uncomfortable with doing it. You may end up doing it incorrectly and injuring the feeder.
And if you do plan on CO2, then I would do the baking soda+vinegar route. Dry ice may get costly if you're only going to do one rat at a time...

Airline tubing and a paintball canister full of co2 is easy and inexpensive