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The main point is your ability to deal with the customers and not your knowledge. As tech support you will have a huge database to help you help the customers. As others have posted, be confident, but don't act like you know it all. Show that you are willing to learn.

Dress professionally, yes a tie (even though once you work there you will probably go in jeans and a T-shirt)
Be well groomed. If you have a facial hair cut it, then let it grow back after your hired.
Get a good nights sleep
And show up 15 min early. (If you might show up late have the phone number and call to let them know beforehand.)

Good luck!