Speaking in front of a classroom of American students for the first time is rather scary. The anxiety and fear you may experience could negatively effect your teaching. Here are some recommendations to reduce your stress:
Remind yourself that is normal to feel anxiety speaking a foreign language in front of a group.
You need to build on your strengths and not focus on your weaknesses. Think of your unique contributions to the classroom as an international instructor.
Share your feelings with others who are going through this same experience. Attend the TASC meetings so that you can learn to cope with this anxiety.
If someone is having problems understanding you because of your accent, don't panic. Take a deep breath, try to speak slower so your words are clear, and think if there are other words you can substitute for the question or point you are trying to make.
You do not have to attempt to speak like a native English speaker. Set reasonable and attainable goals for yourself.
On the first day of class when you are introducing yourself, do not apologize for your language shortfalls. Explain that you speak a foreign language and that you will attempt to speak English as clearly as possible. Tell the students that you are trying the best you can. Encourage students to ask you to repeat or use other words to clarify a certain topic if they do not understand. By letting your students know that they can clarify a phrase that was unclear, your students will feel more relaxed and not feel frustrated that they are missing something from your instruction.
Have a positive attitude! If your students see you happy, this feeling will emanate to your students.
Be confident. Speak Slowly. Enunciate your words clearly.
Another way to reduce anxiety is to be well-prepared for class. Use visual aids so that the class can follow your instruction easily. Give out handouts to also ease transitions with topics and create concise instruction.