I agree with the two previous posters, but would add silence is essential, car doors slamming, actions closing on guns, yelling at dogs and companions, all will make you think the field is empty. More like big game hunting than upland. use any wind to your advantage, as noted. Moving slow and erratically, assume there's a bird everywhere and anywhere, so be ready. Snow helps a bunch. Try to hunt cover the opposite way it has been traditionally hunted, go deep onto public areas and work your way out, birds are used to the opposite. Good Luck.