It'll take awhile for you to sort out all the application materials. It's up to you to utilize that time period to reach out to others around you and practice as much as you can. Good luck!
Hee, silly. Talk to as many people as you can, so you'll get used to different accents and styles. You can practically volunteer 24x7 if you wanted to. You're lucky to have an English environment around you, make the best use of it, deal with your fear now, and you'll feel confident walking into that interview.