Re: Write what you know
I agree with TJ that emotional realism is easier to capture than physical. Actors do it all the time. The trick is to find an experience that put you in a particular emotional state and then play through the scenario you are attempting to create and filter it through what you know of the character.
Just as an exercise, take the divorce. For each spouse work out how they feel about the other and what their motivations are coming into this divorce. Then think of something that makes you happy, and play through from one of the couple's POV how they handle the divorce with this as their predominant mindset. Repeat with the other and in various emotional states. Eventually you'll find something that rings true for each.