in my opinion, the quicker you break them , the easier in the long run , i have did this b4 in a week or so, with a cage or aviary where they can see out, making sure they are confident in their new surroundings, i would leave the old shed in case i would need to uplift them first time out,, then knock it down, i did this b4 myself , a bird flying dorchester for the previous owner, then 21 days later, the bird scored in the snfc sartilly for me, to my loft, i also shifted its box,its mate ,and its nest pan, along with its nesting material,, with the hen ready to lay,, put it in the exact place in my loft,[bottom left],, with a board in front of the box, after the hen laid , i moved the board further and further away from the nest box, both sat on these eggs, when the board was removed completely, the cock was able to see its new surroundings from the sputnick, i then let the bird out when the rest were taking a bath, the cock took a bath, sat for a while , then returned to the old loft, i brought the bird back the first time, i let the bird out the next day, the previous owner chased it, it was out overnight, then returned, this was all done within 8 days, it flew back and forth from the old loft [about 6 miles away] to mine twice every day , three days b4 basketting for sartilly [505 miles] i put a big y,b under it,took the hen away [this was its first yb of the season] alistair mcuddin released from his home at freuchie [30 miles north of me,,, the old owner , willie pentland [deceased] was south of me,,, the bird dropped to me, then went right on to its yb,, if i remember right, the bird was 102 open snfc sartilly