Amen to 3/4 drive (might be cheaper to hire if you don't have access to one). Too easy to snap 1/2" drive if the nut is as tight as it should be. I have one which gets loaned out to T25 owners within a five mile radius. Not the most well-used tool in the box but no substitute really.
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get new castle nuts in before you start
one of mine wouldn't budge even with 6 foot of scaffold pole over the breaker bar, had to split the nut with a chisel....