To get past the "I don't knows" just practice how you would answer possible interview questions. Common ones people stumble on are "Tell me about yourself.." (it's easy to go "uhhhh" on this and ramble about unimportant things).
"What's your biggest weakness?" think of something that is not major and add what you're already doing to overcome it.
"Where do you see yourself in 5 years" answer honestly, but also add how this job would relate to your future goals.
A lot of interviews are incorporating team cooperation into their questions, so if one of those comes up be prepared with an example of how well you work in a group as well as independently.
If you're going to deal with customers, be ready for examples of times when you reacted maturely in regards to someone freaking out on you (school/work examples are better than family examples).
At the end of the interview, emphasize reliability. Make sure they know you're not going to call off randomly. You can say something along the lines of "I understand other applicants may seem more qualified for this job, but I can continuously show you how reliable I am." You could mention that everyone has to start somewhere and you would be excited to start in a place that really interests you.
At the end, they always ask if you have questions. Most of them want you to care enough to ask at least one question, even if it's as simple as "do you promote within the company?" or if you don't have previous work history you could say "how did I do? This was my first face-to-face interview" (They'll never know lol). This also lightens the mood and explains any nervousness. And if you do great they'll think you're a social genius.
You might want to google some example interview questions and make sure you're comfortable enough for an immediate response.
If you're the type of person who gets sweaty hands when nervous, keep your palms flat on your legs so before you leave you can casually wipe them before shaking their hand again.
Good luck!
Any advice is greatly appreciated.
