Without dogs it is a tough mission. We did it a few times when I was younger, having two people, one walking each side of blackberry rows which is where we had the most success. A lot of the time they will go in and hide and not come out, but sometimes you’ll get lucky and they’ll run all of the way through to the other person.
With dogs, they come out no matter what because the dogs chase them through.
good luck out there.