My pair is incredibly calm, they take treats from my hand, come running to the aviary door for food/treats, and even with my 70 pound dogs jumping the wire..they could care less.
Now....
They were raised by me from ducklings, I kept them in a relatively small brooder in a high traffic area, and never held them as ducklings or chased them around the brooder....so I was never seen as a threat. I would offer treats allowing them time to come to me...at first LOTS of time! I also whistled to them before I fed or gave them treats...they now come running!
Before I released them into their aviary, I placed them in a smaller cage inside the pen, allowing the ducks to get accustomed to the outside world without the room to panic and injure themselves. After a week they were not bothered by the dogs walking by... or much else, and were let into the avairy.
When I'm in the aviary, I have to watch my feet because they're usually close by. I move slowly and they respond by doing the same.
Of course I had the advantage of raising this pair from very young, but you can still calm adults. I've had a few pairs of crazies before and I would just take a chair and go sit in, or just outside the pen. It may take weeks or even a few months, but eventually, they will become accustomed to you...perhaps not eating from your hand...but little or no wire collisions.
As others have said, clipping wings, moving slowly around them, and offering treats, will all help. .... and of course. .....patience!
Best of luck with them, they are fantastic Birds!