Hi Dean, i'm a newbie on here as well but not a newbie regards permissions.
It will get easier for you each time now as you can now say to the next farmer "i shoot for Mr ??? up the road and do some name dropping. (and take your written permission to show to the next.)
I found the first the most difficult but after that....easy street, i'm now deciding which to give up or pass to a mate as i cant shoot them all.
Being an air gunner willing to shoot small vermin gets you in the door, regular chats and updates for the owner keeps you there, and will expand the shoot area from the rat in