On calling your own shots out:
I wouldn't make a call on a shot that I hit that lands near the opponent's baseline - too far away for me to see.
But I will often call my shot out when I am going down the line and have my opponent on the run. He is looking across the line while I have a perfect angle. If I see it out I will just call it when I see it even if opponent has not yet made a call.
With 95% of people if you treat them fairly they will do the same to you.