I worked in a grocery store meat department in high school. I wasn’t a butcher, my main job was wrapping the meat for the counter, weighing and pricing it, but over time I learned to do basic meat cutting, still nowhere near a full butcher but getting some basic experience.

Point is it’s an apprenticeship that takes years and starts with helping a butcher do low value stuff. Grabbing half a cow and trying to cut it up probably isn’t the best entry point or test of aptitude.