Hey Jim, you've put penetrant oil on those nut / bolt combos?
They've got the split spring / spring washer on those, so it will feel tight, but it will come loose no problem, just need confidence.
What I found helps is to be able to turn the half shafts freely to position the 2x spanners.
I used a flange spanner on the bolt end with a normal open spanner on the other end - you'll find that the half shafts flanges on the wheel end tend to get in the way of turning the spanner, hence why you need to be able to move the diff freely. Hope that helps bud