I helped a local Vet try to get a Mare to nurse a foal who was rejecting her first birth. He had the Mare in a twitch and was cussing her something bad. I asked if I could help and was refused and asked again. After I held and guided the foal who was less than an half hour old to the teat while watching this ordeal from the corner of my eye. I am of the opinion that I would not trust many people to properly use a twitch.
Old joke:
What do you call the person who graduates last in their veterinary class?
Doctor.