I think I can clarify a couple of those things. The angry yelling portion is not directed towards the dog or handler. It is usually done off to one side of the room. When I helped with evaluations we picked a silly thing to argue about like stinky sneakers or parking spaces. With my first 2 Labs I was concerned how they would react to this so I had friends stage short arguments while I fed treats to the Labs. The Labs got so tuned into it when they heard people raise their voices the dogs plunked into a sit and looked at me for a treat. While treats can not be given or even carried by the handler during the evaluation it is very nice for the dogs to have the association of good things happen with loud voices. In real life during real visits to nursing homes it is invaluable to have the dogs look towards to me if a resident had a loud frustrated or confused moment. The loud noise test is often something like a clip board or cookie sheet dropping out of view of the dog. The point is to see how the dog handles sudden loud noises, does it recover quickly and how does the handler help the dog recover. I have stainless steel dog dishes so some banging and clanging is part of mealtime. Also I train the dogs to look at me on cue, if they get distracted I can regain their attention. Again, with Labs it's all about treats for training. Meeting the neutral dog was the toughest part for my dog June last week. The dog can not cross the handler's center line as they approach the person with the neutral dog. Even with a lot of practice the bottom line is June really likes meeting dogs. As we approached the other dog handler I had to stop and quietly remind her to heel. Before I tried to shake the dog handler's hand I took a moment to tell June to sit and stay both with words and hand signals. Something to keep in mind is that therapy dog evaluations are not like obedience competition. The point of the evaluation is to see that the dog is safe and predictable and how the handler guides the dog to succeed. Delta's 8 hour handler course is very helpful before doing a first time evaluation. The Canine Good Citizen test is similar to Delta's evaluation. If you can take a class for it or even simply take the test it could be useful practice for your dog. Also the Delta site has listings of registered teams, instructors, evaluators and affiliated groups, there might teams in your area.
