I think this is a worthwhile thread for pilots facing any flight test, and especially an advanced flight test like the IR
Examiners are human and range from complete w@nkers to great guy/gals. Get one of the later and you will not only pass but pick up a ton of great information/tips/procedures etc. Get one of the former and you day will be pure misery.
BUT the aim of the flight test, especially a CAA/JAA flight test is not to actually use skills which you will practice every day in real world flying, it is to demonstrate the manoevers specified in the test guide to the standards set out, even though some are patently stupid. Therefore you have to go with the flow. The point of the exercise is to pass the ride.
For commercial pilots changing operators will result in the same situation. It doesn't matter that your old operator did things "this" way, the standard is to do them the way the new operator specifies, even if you don't agree with the procedure and think your way is better.
There are not that many examiners around and they all have reputations. I see no reason to do some research on your examiner and find out what their personal likes and dislikes are. Arguing with an examiner is completely pointless. Everything he/she says is right as far as you are concerned. When asked a question, answer the exact question, with the minimum of explanation and then shut up. Over explaining will likely take you down rabbit holes which gives the examiner a legitimate excuse to pursue with further questions.