We basically do what Jen has stated above. I really like her idea of using dummy twine lines. Our dummy lines we used the electric wire, just didn't hook them all up.
The twine sounds a bit more affordable than having to get all the clips. We did add a few dummy lines, where there drops in the fence due to elevation change.
When we use trees as post, we slid the hot wire into some black plastic irrigation tubing that is stapled to the tree, and any old hose will work.