Fantastic advice! One thing that might be a precursor worth mentioning is practicing awareness. The ability to take ego out of the occasion or focus on solutions instead of blame relies on one’s ability to see, hear, or feel it happening. People who are naturally more aware of their inner state will have a much easier time putting these principles into practice.
The Harvard Negotiation Project has some fantastic publications that I highly recommend looking into applying these and other principles. The two that I have read are “Getting to Yes” and “Difficult Conversations”.