I used to keep some geese. And yes, they are mean! Here's how to handle them- slap them! As they try to peck you, just hit their heads (half way between just pushing their head aside and an actual slap). You have to hit them hard enough that their body turns slightly away from you. After two or three times, they usually give up and waddle away. You do have to be fast as you do it. If you hesitate, you will get pecked.

They are attempting to display dominance, and you just have to be more dominant- they'd act like that to another goose. My kids (9 and 13 at that time) could "bap" the geese, so I think you can manage it, too. I miss having geese and chickens. - Granny:hippy: