Yep. Find a shady spot you know big catfish frequent, logs, brambles, submerged structures, which coincidentally are places alligator snapping turtles like to frequent, and stuck your arm in there. Kinda wave and waggle your fingers, and if something is there itll go for the lure (your hand). Grab its mouth, hold the fuck on, and go for broke.
Its even more fun when you're three sheets to the wind on Lone Star and Pabst beer.
There is none because anything other than just shoving a hand down there is likely to scare off a potential catch. Luck of the draw i guess. Its probably why i was always a bit buzzed doing it- it takes a bit of liquid courage to get you to do this shit.
The dude who took me noodling my first time was missing part of his right ring finger, and pinkie finger after having them bitten off by a snapping turtle some years prior. Crazy fuck would go under water and seek out hollows and spots where they might be, and noodle them while submerged.
It was a whole ton of fun, really. Bunch of half lit dumbasses trying to get catfish to swallow your hand so you can yank them out of the water and show them what everything looks like above the water line. was always fun rounding everyone up, buying a couple cases of Pabst or whatever was cheap, and heading out to just cut loose and accomplish nothing of consequence.
Havent done it in almost two decades, but id do it again if given a chance.
Catching fish with your hands isn't easy, but if you know how and you've got pre-industrial devastation fish stocks it's doable. Fishing spear or gig is easier though.