Way back when, before things got so terribly PC, a lot of us would have a few 'hydraulic stabilizers' during a shoot. It do help take the edge off the nerves.

Pup, a month or two on the blind bales work for many folks. But others? Put a dot in front of them and they freeze up again. It's definitely a good suggestion though, because one never knows if it will work for them until they try it.