Blitz,
Food for thought...your mileage may vary.
Be early (fifteen minutes at least).
When you walk in, carry yourself with confidence(i.e. no slumped shoulders and/or other negative body language).
Presuming that you are in the U.S. then a firm handshake is appropriate when shaking hands with men, be somewhat more gentle but firm when shaking women's hands. This is an introduction, not a strength test. Look folks in the eye and wear a polite smile when shaking their hands.
Make positive eye contact, but don't stare and be sure to include your entire hiring audience in your vision while speaking. One person may have asked the question you are now answering, but they are all in the room with you.
For most office environments a suit and tie is good but don't wear flashy jewelry and be sparing with cologne and aftershave.
Make make to use the restroom [yes, even if you know that you don't have to, you may surprise yourself and this is definitely one less pressure that you DON'T want to have to contend with in the interview] and if the planets line up against you and you do suddenly have the urge, then simply state so and ask where the restroom is (but only as a last resort) the interviewer is human too and will most likely understand...however it does reflect on your prior personal planning.
Be sure to drink about half a liter of water and brush your teeth. The water will keep you hydrated for the hour or two that you will be interviewed and the personal grooming is always good form, be sure that your hands and nails are clean as well.
And while it may bring great pride to wear and display your [insert your favorite charity / organization / school insignia etc.] tie tacks, cufflinks watches etc., now is not the time...these items should be neat but relatively plain. If the interviewers want to know what organizations you belong to, then they will ask, be aware however these questions can lead to discrimination suits so most knowledgable folks will not go there...
Do not be unduly surprised if you walk into a panel interview with several interviewers. Having just conducted 4 such interviews with two other panel members in the last 7 days for postion we're filling in my department, I know that it can be a bit of a shock to the interview candidate. If this is the case for yours, then take a deep breath and smile. If it is your first panel type interview,then it may help to you to relax if you to state the fact (after you've gotten done with the introductions).
If you do wind up with a panel interview, they will likely either have name cards front of them to help you with names. If they don't but they do provide you with their business cards,then arrange their cards in front of you in thesame order that they are seated around you. If there are no name tags or business cards, then take one of your spare sheets of plain white paper(you did bring some with your other documents right?) and neatly write their names and keep it in front of you. This shows organization forethought and keeps names straight when you are under pressure.
BE PREPARED> Without fail, bring a copy of your job application and several copies of your resume with you (and know what you've got written on all these documents). It is frustrating for the interviewers to review a nice resume and/or job application, then when the candidate walks in and starts speaking,it becomes very obvious that there was a ghost writer involved becuase the candidate can't answer basic questions regarding these documents.
Bring your identification (drivers license, Social Security card, green card, resident alien documents, passport etc., even if you were not asked to do so and you do not expect to travel or drive for the company). Having the resume, application copies, license/s etc. on hand shows that the candidate is serious about this interview and knows how to think ahead and be prepared. This includes bringing two working pens (blue and black ink), a highlighter and small but easily read and operated hand held calculator that NEATLY and inconspicuously fits your inside coat pocket.
It has become rather common to ask for a work sample demonstration. The actual work samples will vary by the position applied for, but if you say you know Word 2007 [or insert any other program that applies here]then don't be surprised for example if they give you verbal instructions and ask you to put them into document form. They are testing listening, cognitive and application / knowledge skills.
MAKE SURE that you understand the question and/or directions before jumping to conclusions or answering in haste.
When answering questions, give the answers requested, but try to avoid rambling or any self depreciation.
If the question is something that you don't know the answer to, then DON'T stretch the truth, overtly dodge the question and especially do not lie on any questions (job applications, verbal, or otherwise) as virtually every job now has a hiring clause somewhere that states that any intentional fraud and/or lies may be grounds for termination, now or later.
Expect to be asked why they should hire you. This type of question is basically designed to put you offguard and cause you to demonstrate thinking on your feet. If you are caught offguard by a question, you can generally buy an additional moment or two of time by stating something like, "now that's an interesting question" or "I'm glad that you asked that question" while your go into mental overdrive.
There are a number of good websites that go into great depth and detail on interviews and job searches etc. It is good to look some of these over every now and again.
You stated that your big day is Friday, so if that means tomorrow, then DON'T stay up all night cramming.
Hope this helps out. Please let us know how things go.
Regards,
Comanche7