Not much to add, it's simple really and there isn't much you can do that would totally hose anything, just make sure you don't accidentally turn your hotwater heater On before it's full of water. You don't want to fry the heater elements. There is also generally another valve you need to find on your water pump that will change the intake source from the plastic hose 'winterizing' hose back to the main source. Make sure your water pump isn't sucking dry air for too long when you bring it back online.
I do mine similar to RogerR except for a few trivial details which I do differently. My water heater is bone dry when it goes into storage, all my faucets are left in the open positions and I leave my low point drains, pressure relief valve, as well as the drain plug on the heater open / off all winter. I flush everything fully in the spring and add the hot water heater back into the loop as one of the final steps. I don't do anything special with respect to flushing it. If I think the water smells funny in the spring I flush the whole system at that time. We don't generally drink the water out of the taps, but if it smells 'off' I do the bleach solution flush, sometimes I don't bother with that step.. to each his own.
Take some pictures of how your valves are setup while in 'winter mode' so you can refer to them next fall, or if you get hung up on something you just changed. Adding my hot water heater back into the 'loop' is typically the last thing I do.
I'm also an IT guy, but trust me, winterizing / de-winterizing is a piece of cake. Most of these systems are similar enough you can watch youtube videos of different campers and do what they do.
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2016 27BHS Elite
2012 F-150 EcoBoost / Max Tow (Sold)
2017 'Blue Jeans' 6.2 F-250 Lariat 4.3 gears.
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