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Jim, prep it like you might a paver walk or patio, except that having a perfectly flat prep isn't as critical; the concrete will fill in where it needs to.
Keep in mind the concrete WILL crack, and take the advice of others here who will advise you to plan your concrete relief joints and bluestone seams carefully to allow for that cracking.
We've been tackling more and more mortar work, but that's mainly because that's my next 'mountain' ("Why'd you climb that mountain?" "Because it was there."), but I think you'll install it faster and have a smaller chance for headaches and callbacks doing it the way you've done it in the past.
That's my $.02, anyway.
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