thaworm, I get the part about being introverted, small talk, etc. Ditto. It is a red flag to keep to yourself.
If I could rephrase your post, you already nailed it: "I tend to be introverted, but on the other hand I currently fill in for my super , make sure everyone ... answer all questions. So it could be viewed as a weakness but one I am coping with successfully."
I have been to more job interviews than I care to count, Therefore I have become skilled at interviews and present well. My best suggestions:
look on the net for sample questions. There's a million of them, just try to get a few under your belt.
The decision will be made within the first 30 seconds of you walking into the room - this is from pro job coaches, interviewers, and headhunters. So, dress well, one step up from the job. If blue collar, wear a white shirt. If no tie, then wear a tie and suit. If suit, then get yours cleaned (if there is time) and make sure your tie, shirt, and shoes are spotless.
Be confident. (Huh? But I'm shakin'!) Look at it this way - you already made one cut. They WANT to see you. They already decided you have the basic tools from your resume. Now they want to see if you were truthful on your resume and how you fit into the company.
Bring a few questions for them - interviewing is 2-way. If you have pertinent questions, it shows you researched the position, company, and are curious. (What do you see are the immediate challenges of this position? How will that change over a years time once I solve the immediate problems?)
How you fit in - biggest thing. Big big big. Smile, Enjoy meeting them. Firm not crushing handshake - yeah it's old but important. Get everybody's name. That day, write thank you notes to each person.
Chill. You ARE the one.