Eyes on the agreement
In disagreements, your goal becomes to prove the other person is wrong and you are right. Would you agree that it does not often work in your favour? What if you instead focused on what you two agree upon first and tried to drive that narrative home as much as possible? Try to establish the fact that you both want the same thing but only the methods differ. To do this well though, you must put yourself in the other person's shoes. Empathize with the other person. Something that might not come naturally and easy to you, but is vital if you want to build trust.
Early NOs in the conversation takes the world of effort to turn around. Try to get a few early YESs and drive the narrative.
"He who treads softly goes far"