Hi Tam, your neck will be OK, coincidentally I was with Brian yesterday and he mentioned he'd put the Heritage strings on Odetta.
As breezy says..always have spares.
I get my Newtones online from Sheehans in Leicester, they are the quickest I've found (Malcolm is sometimes a bit busy), although they have now started charging for postage.
Anyway as for stringing, I give the string a few turns round the post,more turns for thinner gauges, thread it through the hole, tighten up gradually one side then the other as you would with wheel nuts.
Al