Another approach would be to purchase weaned and preconditioned calves. They might very well be worth a few dollars more.
On the weaning, I find that if I have the cows and their calves in one pasture and sort off the cows into another adjacent pasture, separated by a barb wire fence with a hot wire at calf nose height on the calf side, things seem to go well.
I think a key is that the calves are in the same pasture they have just been in with their dams. No change there. And their moms are still visible, just on the other side of the fence...no problem. And for the cows, they can see their calves are ok. I think most of them they are relieved to get the big kid off of them, to be honest! In a couple days every one sort of gets used to being separated by the fence but no big deal....
There are a couple weaned, preconditioned calf sales coming up in Nov and Dec at least in Herefords, according to flyers I've received.
Good luck.
Jim