I regularly interview potential new candidates at work. Everyone is nervous, we totally understand that and nerves are expected, so don't think about the fact that you swllow or go red, we've seen it hundreds of times before, it's no big deal.
Don't throw in buzz words, they are total rubbish and if you are asked to explain what one means or to give an example of the work you have thrown in and you can't, you'll look an idiot.
The best thing you can do, is be yourself, know your cv and experience inside and out and think of lots of different scenarios that you have delat with in case competency based questions are asked (ie if you were in a certain situation - how did you handle it, what was the outcome, what would you do differently next time etc - common ones are about customer service, angry customers, diffifcult employees, sales techniques etc - depeding on the type of job you are going for) as well as the normal "why do you want this job" type questions. Don't give them text book answers - they'll get that all the time, think about why you do actually want the job, what you have to offer the company above anyone else that may be going for the role and state this.
Also and without fail - do your research on the company. There is nothing worse than going for a job and not knowing what the company does, who the major players are in the business and major competitors are etc. Has the company won any awards recently and what were these for? Using something like this in your questions to find out more about the company and role in the interview will show you have taken a genuine interest and done your research. This will make you stand out as you can't imagine some of the people that never research the companies!
Good Luck
Jet