I wouldn't dream of doing that to any cattle - apart from not having the experience to be sure of a clean kill, what would be done with all the waste products?
Various parts (brain, skull, spinalcord, tonsils, intestines etc, etc) are classed as Category 1 waste and must be stained and disposed of according to the regulations. Then there's the butchery that would need to be done. An average Shetland steer might produce about 200kg (or more) of meat - that takes a long time to process. And finally any meat can only be eaten by the person killing the steer and their immediate family - i.e those sharing the same house.
I don't think it's practical to do home slaughter on cattle - leave it to the professionals, get the carcase properly butchered and enjoy eating the meat & selling it to friends & neighbours.
Sue