Pictures and visuals help me learn. This picture from the USAPA showing how to accurately view the ball as it hits the line. Some players, especially if coming from tennis, may think the ball compresses giving it more of an area to touch the court surface but that is incorrect. A pickleball is hard and only a small section of the ball actually hits the court. Check out this visual and make the right line call.
Help Your Partner With Line Calls. When your partner is trying to make a difficult shot, it is often hard for that player to concentrate on the line and the shot at the same time. Your partner is counting on you to make the out call if necessary. It is very common to see players looking straight ahead while their partner is playing the ball. You should always watch the ball so that you can help your partner with the call. Otherwise, you may be giving away points if your partner is unable to make the call.
If your partner calls the ball out and you see that it is clearly in, then you should declare the ball to be good. When you disagree with your partner about a line call, the benefit of the doubt always goes to the other side. Never play the point over. ( I am not sure about this I will check with Cindy and Nancy).