Aw, come spring, you'll be able to put in a T-post with just a few taps of the post driver given the quality of the soil. Much faster, more accurate, and easier in the long run than messing with a mechanical device. YOU CAN DO IT!
Plus, digging post holes with a clam shell digger will be quite doable. You mentioned that you might have a helper for the project.
It sounds like a "just keep at it" project like with your 60 posts. Ten a day is nothing. Bet you can put in 60 easily in one day. Then there is string the fence...now, that takes a bit of time.
This paddock experience should give you the confidence and experience to do the remaining fence.
The 10 a day is just to motivate me to get it done in a week. Also rather than let them all stay until Saturday. I have an hour or so of usable daylight this time of year when I get home. So that is 1 every 6 minutes. Paddock will be outlined and string laid this week. Then saturday shopping spree at farm store and start pounding.
Also will have to put insulators on and string up the electric fence.