Little is required. It’s made more complicated than is needed by some old farts with attitudes.
Get a pack of films and follow the burr method and you are doing except for learning to strop which takes a week.
That is still more than is required to use a cartridge. Go to store, buy a razor, shave. No need to worry about finding lapping film, no need to learn what the burr method is, no need to find a decent straight razor. No matter what you want to believe shaving with a straight has a learning curve and most people don't have time/patients for it. Cartridges have no learning curve, and any young man/woman with $20 can get a decent shave instantly.