Hi John,
It's been a while. grin

We use this sort of thing over here in New Zealand to protect our earth rods:

Earth Rod Protection Box

Personally, I've either used an apprentice with a hammer/sledge hammer or a Hilti concrete/impact drill with a large socket on the end.
The worst thing you can have happen when driving an earth stake is have it strike a stone in the ground and have it come up behind you.
That is our soil here.