Thank you for bringing up such a great topic. There IS so much potential for growth, both personally and in opening another level of honesty in one's relationship to another human being.
I feel compelled to share the biggest thing I've learned about approaching uncomfortable conversations, which relates directly to what Jeanne said:
For all the time you can spend worrying about what you (and someone else) are going to say, to really express the difficult thing takes usually less than 30 seconds. With practice, it becomes like jumping in a cold river. It's normal to feel the excitement and hesitation before taking the plunge, but it's always worth it.

