I've never milked a ewe, just my dairy goats.
My La Mancha was a real kicker, (I ended up with her because she caused trouble at the dairy with her kicking)
When I first brought her home, I got her up on the stanchion and hobbled her rear legs. She gets her special goat pellets or grain while I'm milking. I used gentle talking & hand on the rump, sort of patting her and moving hand down her thigh and saying " It's ok Paradise, I'm going to milk you now so hold still and don't kick"...Then I sort of gently bump her belly with the edge of my hand, in front of the udder so she knows I'm there... I think it helped calm her down and she doesn't get startled... she got used to this routine after a week or two and pretty much doesn't kick now.
I don't have to hobble her any more. I still use the hand on the rump and thigh and talking... She fusses a little once in a while, but I've learned to read her body movements and pull the bucket away so she doesn't knock it out of my hands or stick her hoof in it. Especially in summer when the flies are landing on her leg when I'm milking she has a reflex kick, so I can't get cranky at her for that, so I use the move the bucket method and curse the flies :-)