live rat problem

[satomi325]

You may want to try feeding smaller more frequent meals. Less work for the snake to kill and less chance of something like that happening again.

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...