Original post by SlowlorisIncognitoFirstly, most people get a bit nervous about interviews. A good interviewer will do their best to help you relax- they won't be trying to trip you up. Questions vary hugely between interviews, but most interviewers want to know a bit about you and what your interests are- don't lie, but do link them back to the job role. For example, if you're customer facing, saying something like "In my spare time I enjoy socialising, and this means I'd be good at talking to customers and building relationships with them."
Some good tips are to research the company online, on their website, they will often talk about their mission statement, and sometimes you will be asked about what you know about the company. If you can still access the job advert, also check that to remind you what the company is looking for.
Sometimes you will also have a skills based interview, where you're asked to complete a number of tasks in order to check your competence. Usually, these will be relatively simple, e.g. type up a letter in Word, create a spreadsheet in Excel, maybe deal with a pretend scenario.
Dress smartly, but not in a way that makes you feel self conscious- Trousers, blouse and a blazer with smart shoes is fine- don't wear heals if you aren't used to them. I normally put my hair in a bun, as it's quite long, and I think this looks more professional. I also wear a bit of natural make-up, but again, this probably isn't a good idea if that's not something you'd normally do.