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Beren,
My gut feeling is use it either of two ways.
I use the N/R feature, and shoot depending on the conditions, 2 - 5 minute exposures, and accept the equivilent amount of "downtime" while it does an automatic dark.
Alternatively you can shoot without the N/R and make this dark after the event, and manually subtract it.
If you do this, you can make a selection of library darks, and save time. You happy with this procedure?
If not just use the built in N/R, I find it works well.
My first shots were of Comets Neat and Linear, and using the old ugly Nikkor 300mm @f4.5, at about ISO800 - 1250. Exposure times were around the 2 to 3 minute mark, and were very good.
Go for it, and don't be put off by all the jealous Canon owners, Nikon rules.
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