Fall calvers almost always calve by themselves. For a few years, I calved 30 cows in the fall, just to spread out the labour required doing calving season. There is a limit to what one person can do! My fall calvers calved on a pasture 5 miles from home, and in 5 years I never saw one born, and I do not remember losing a calf at calving time. I never even checked them real regularly.
A friend of mine, moved his calving time from February - March , to May and June, several years ago. He runs over 400 cows and he drives through once every couple days just to tag the calves. I have no idea how he catches them as he uses black Simmi bulls on Angus and Angus cross cows. It is not so much catching the calf, rather it is keeping an angry black range cow from trying to do her Fred Astaire impression on your chest. He says he very seldom has had a calf die during calving, and I don't think he can even remember where he put his calf puller and chains.