After the interview
As the relief hits you when you get home and realise it's all over, don't forget to review your experience. It's quite rare that you'd only have to attend one interview so instead of relaxing too much, write down all the things you have learnt.
Make some notes
Think about whether you arrived on time and if your outfit was the right choice. Write down questions you think you answered really well and what you said, as well as the ones you struggled with, so that you can think about them for future interviews. You might want to use a checklist to help you to see where you might need to improve:
Did I sit still and not fidget?
Did I answer all the questions fully?
Did I sell myself as much as possible?
Did I describe my experience well?
Did I maintain good eye contact?
Did I remember to smile?
Ask for feedback
In order to learn as much as you can from an interview, it's important to ask the company or your recruitment agency for feedback. It's not always nice to hear about your weaknesses but it is an essential part of becoming successful and getting the job you really want. The company should pass on both negative and positive comments so you can aim to become more prepared in the future and increase your chances each time.
Keep searching
After the initial excitement wears off, you might feel a bit confused about what to do next until you hear whether you got the job. The best things to do are to stay positive and keep searching for new opportunities.
On fish4jobs you can search for a job in minutes, so don't let yourself miss out on other opportunities just because you are waiting to here. Keep applying for other positions and attending interviews, so that if you do get a disappointing 'no' from one employer, you'll still have eggs in other baskets.