You are constantly receiving input of information from their energetic self to your energetic self, and while you develop this skill, you need to take the time to reflect and analyze your impressions after meeting and interacting with a person.
These impressions will your feelings and impressions to your consciousness. At the initial time of their reception, you may find it confusing because of their constant input. However, once the input has stopped, then you have time to reflect upon the impressions made and can draw a conclusion.
There are several levels of conclusions about personalities. People are not one dimensional but generally have multiple facets. These multiple aspects, or facets, can change with time or situations. In other words, one person may be trustworthy in one situation and not in another. Therefore, as you gain experience with interpreting these feelings or intuitive insights, you will be able to recognize the aspects of the personality and how they relate to each situation.
For example, you may have met someone in a business facet and had a negative impression. Perhaps you felt distrust, of a sense of control. Then later, in another interaction, such as in a nonbusiness setting, your impression may change. This could indicate to be cautious with this person in business dealings with this person.
Now a word of caution about personality sensing. Many people have learned to project a false sense of security. These individuals are often considered con artists. They have learned through experience they can project feelings of confidence to others. Therefore, in personality sensing, one needs to overlook what is apparent and seek that which is underlying by reacting to your first impressions.