I'm sure someone else will chime in. I have not done that so, I don't know if your missing something.
I'm just throwing out the tricks for braking loose a stubborn bolt.
Get some penetrant. Apply liberally. Thwack the bolt a few times. Apply more penetrant. Thwack some more and go drink a beer. Try to loosen the nut. If it didn't work, repeat. Either it will come loose or you'll be too drunk to care
Oh, and use 6 point sockets, not 12 point. You mind round out the bolt with a 12 point.