I really enjoy your enthusiasm about shooting your squirrel. It's been 32 years and many, many squirrels ago for me but I remember well. When I was 12 I spotted my 1st and chased it up a hickory tree, then went round and round that tree, and so did the squirrel. I finally got a shot with my Marlin 22 and my squirrel hunting saga began. Get a good, squirrel eye accurate 22 and have fun! I always used a Marlin with open sights and just bought a Ruger 10-22 that shoots just as well. Practice until you can hit them in the eye everytime. I practice shooting twigs off trees or shooting weed stems. Or sometimes I line up empty rounds or acorns on a log and shoot them one at a time. Annie Oakly used to shoot cigarettes out of peoples mouthes. An easy shot for me, but no volunteers to hold the cigarettes!