For snow driving I was always told to put it into 4 WD, drive forward to engage the Auto Hubs, and then put it back into 2 WD, without reversing.
That way, if you get into a position you need 4WD, you can just engage it, while remaining control in 2WD should you get into a skid.
If you do not engage the hubs and get stuck, it's too late, pre-engaging 4WD means you stand a better chance of getting moving again.
Mark