Having a strong constitution during this time is imperative. It's like standing tall and strong while your wife beats on your chest because of some anguish she's feeling and not bowing down... Listen... even if you find it difficult to validate, just look at your W when she's talking and do your best to remain calm and do not refute unless the counselor gives you the floor...
When you are given the floor, do not speak on your W's comments. Stick with your own agenda. Again, if your W refutes while you are speaking, just keep speaking or look to the counselor to interject and give you the floor again...
Again, these may or may not be things you already know. I'm just repeating them to keep them in your mind.