You will be judged by subjective, personal attributes - your appearance and even your speech. Maintain a professional manner on the phone, smile when talking makes a big difference. Establish relationships with your users, make people feel important by remembering and using their names. Personal promotion is a large part of our routine, whether intentional or not. It dictates the library's overall image.
Staff are reluctant to knock and enter the library when the door is closed.
Even I would rather walk away than knock on a closed door. My library consists of an office, but the door is always open. If this isn't possible, have a sign, inviting people in. Keep it clean and attractive. Use signs to direct users, arrange your collection in a user friendly manner eg.