I find things more stressful now too. I have worked out a relaxation technique which really does help. You need to go somewhere quiet, preferably outdoors, no-one else around. Sit down, regulate your breathing, close your eyes, then concentrate on what you can hear and smell, near and far. I hear nibbling sheep, snuffling dogs, cheeping and screeing birds, the breeze, rustling leaves, various smells (not always very nice), distant vehicles, snufflings in the undergrowth. If I'm indoors it may only be man-made sounds I hear, but it still works. Keep your breathing slow and relax into what you hear, not letting other thoughts in. It is also possible to consciously lower your own blood pressure. Do the relaxation each day. Make sure not to wind eachother up before the interview, and don't have differences of opinion in front of the examiners. Definitely no alcohol.
For your interview, KNOW you are the best couple for the opportunity. Have a look through the info they already have about you, and think what extra stuff they may need to know. Be confident and sell yourselves.
To wear, if your interview is on the farm, a nice clean, but not brand new, boiler suit would be ok, or just jeans, a check shirt and boots. Don't be scruffy, but look like you are happy to muck right in. If the interview is somewhere else, I don't have a clue
Good luck both, and tell us how it goes
