It's taken about two years for us to be brave enough to try portable electric fencing with the sheep. I couldn't figure it out. And it was expensive. But we did it, finally! Now we can use sheep as lawn mowers and weeders. I'm crossing my fingers and hoping they don't just run away.
As I write this, I'm watching them through the window, and they seem to already be gnawing on the weed trees. Excellent.