It is not only regarding the service which he asks from other people that he must weigh with just scales, for with everything that he asks from his friend, and indeed every interaction with others, he must be extremely careful not to be a burden to his friend. He must assume that nobody wants to be kind to him, and also that even a small amount of effort will be very difficult for them, and therefore not ask anything from anybody unless it is absolutely crystal clear to him and he has fully understood that even in the depths of his mind his friend would like to do the act. By doing this, he will find favor in the eyes of Hashem and people.