Well, the information is in these forums many many times over. This is your rig, and it's your responsibility to look after it.
It takes about one hour to do it right. Your dealer might be busy and not get to yours before it freezes solid and cracks all kinds of things.
It matters not about the grass under it, protect yourself and look after what is in it. Drain the water, clear the tanks, blow it out or put in the antifreeze properly. Let it sit on it's wheels, do not lower jacks.
Absolutely disconnect the battery, crack a vent just a tiny amount and all will be just fine without too much worry.