No harder than driving a metal T post. I did it in a couple of hours. Just checked, I'm at 16 feet.
Another question (yes, I've been told I'm full of them or it). I have a post pounder that I use to put in the line post for my chain link fence. It's just a weighted pipe with handles and you put it on top of the post and then bring it down with force and it drives the post. As long as the spike isn't too big around for the pounder, does that sound like a viable option for Georgia clay (and granite)?
Doh' color me an idiot, I should have watched the rest of the video, since that's how you sunk yours. Sorry....
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