Snip what you need from the pelt and remove as much of the guard hair as possible. For killing any critters you can freeze the pelt or microwave it. I prefer the microwave. Hit it for about 15 seconds on high and then feel the pelt to make sure there is no moisture which could get the pelt hot. If it's not hot, I'd microwave it for 30 seconds. That will kill anything.
"Here fishy fishy."