Rosemary looks like a big teddy bear leaning against Jim as he positions her for shearing. Once the sheep are on their backs they mostly go limp.
But you have to get them there first.
In this Video Tom walks Kim to the other side of the barn where his shearing station is set up. Kim gave in pretty easy. Liam and Pumpkin gave him a harder time.
You can see how once the sheep are on their backs Jim and Tom can move them around pretty easily.