When ferreting i would devide the whole thing up into sections and work on both sides at the same time so you can watch for each others ferrets walking through and away
net everyting you can and devide the sections withvlong nets as the rabbits will most likly run the length of the bank get in yor long net or back net
i would also put a locator box further along the bank switched on taped ti a stick stuck in the ground at least that way you will know when the ferrets move along