Jerry Weinberg says no matter what the problem is, it's always a people problem. This is especially true for pairing. You can have a perfect CI setup, big monitiors, extra keyboards, and fast tests, but this won't fix the most interesting pairing challenges. (Like when you wonder what to say when your pair is hunched over the keyboard, or when you know that your pair is lost, but it's easier not to bring it up...) When you're in the coaching role, learn what you can do to overcome the barriers and create real pairing flow.