So the practice is simply to be with what is.
That means that when we feel complaint, we can be with the feeling of not liking things the way they are. We can be with our irritation, frustration, anger. We can be with our fear underneath all of that, the fear that we won’t be OK if we don’t have control.
We can be with our narrative about how the other person should act differently, or that we should be different than we are.