Personally for winter camping, I save the black tank for middle of the night bathroom trips. Just flush with windshield washer fluid. Unless you are making the tank more than 1/3 full, there is little risk of freeze damage. The important thing is to know the shape of your tank. Most are quite flat.
I have also de-winterized for a March trip, as long as highs are well above 0 and lows aren't too low. Once again it's about the layout. My water heater is in the same compartment as my water pump, so as long as I leave the water heater on that compartment doesn't get cold enough to freeze.
For your first time, you may not want to risk it. But get one of those indoor/outdoor digital thermometers with the high/low reading. That should tell you.
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