sharoona
You seem to have a very nice attitude. You have already mensioned most of the things you should think about.
During your face to face interview just remember to have a warm smile. Keep your answers informative and within the subject. Dont say bad things about your former collegues or employers.
If you have made it to the face to face interview they think your english is on the right level.
Stay positive, know your CV, be natural and try to get some rest before the interview.
Wish you all the best.
Good luck.