If you are going to kill it , you should eat it. I'm serious. Rattlesnake is delicious. Think of it as a crawling chicken. No need to gut it, just skin it, cut the meat off the ribs, slice into smaller pieces, tenderize with a meat mallet, bread with flour or cornmeal, and fry. Use ranch dressing or your favorite wing sauce as a dip and voila.
Nice tasty white meat.
Two items of warning:
1. Snakes can bite as a reflex action even after the head is removed.
2. There is a musk gland near the vent that can exude some nasty smelling stuff. Don't get it on you or the meat.
3. Tenderizing is not necessary, but snake can get chewy so I do it.
I'm not a big fan of killing snakes, but I'm also not a big fan of poisonous snakes in my yard.