I thought I would try to shear the sheep myself and it is working! They love it. I managed to snip off the heavy coat of wool by using my sewing scissors. It is really easy and I got two sheep done before lunch today.
Now I can save a little money on wool costs.
I have no reference material in my cupboard about 'tubular cast-off'. How did I manage that? I googled and found this really cool blog called TECHknitting. Okay, so now I am back on track.