Tell, tell, tell, yell. (To which we all respond with hide, fight, complain, and deflect.)
Easy but not so effective, is it? What does work?
Build relationship and trust constantly. Agree to argue the points not the personalities. Agree on the why and outcomes before the how, when, and who details. Make sure everyone is heard. Reach true consensus where we all may not agree but we understand and will 100% support it. Agree to be held to account. Hold each other to account.
Hard? You bet. Effective? Whoa, yeah.
In your corner,