Be where they want to be, and be there first. The duck and snow decoys will work fine IF you are at the spot where they were feeding the night before. Not a couple of days before, or last week, but LAST NIGHT. If you have decoys you've got more leeway and can attract them, but you want to be laying in goose poop Saturday morning.
Cover yourself up somehow, burlap, camo, straw, bales, whatever. CAMO your face with makeup, a net, or even mud - that big white face must be concealed. Birds land into the wind, so I put myself on the upwind edge of the decoys. That way I'm looking at the birds as they come in to the decoys. Put a pack under your head. And hope that you're not looking into the sun in the morning.
Unless you know what you're doing, leave the call at home. When the birds are waaay out there, I will sit up and wave my arms like a landing goose to attract their attention. It can turn flocks towards you. Stay still. Wait until they are locked in and cleared for landing. Figure out where a 25 yd mark is (lone decoy) and once inside, you're golden. 2-3/4" and #2 steel will kill well inside the decoys, but you'll need something like BBB OR LARGER for longer kills. Remember that although they appear to be HUGE at the end of the barrel, they're still moving fast enough that you need to swing through them and pull the trigger as you pass their head.
This is by far the most important step. Check the fields every night this week, and start getting permission. If you find a good field, ask for exclusive permission on the Saturday AND the Friday, so they aren't disturbed. If possible mark that spot in the evening. When you are on one of 'those' fields, you can't even shoot them away from it. But all the calling, decoys, camo, shooting skill, etc. is useless if the birds don't come close enough to you.
Good luck.
Grouse Man