The challenge is to maneuver comfortably in the TA role. You are not the instructor of record nor are you a student in the classroom. Many students are uncomfortable when instructors' styles do not meet their expectations. Students' presuppositions of who women are and how they think women are supposed to look or act can create additional tension between women TAs and their students. While these difficulties in the classroom will probably continue to exist outside of class, there are a few things TAs can do to reduce tension and stimulate a healthy learning environment for everyone.
First impressions matter in most situations and especially in the classroom.
You might be concerned about your role as an authority figure. The first few classes will help shape how your students view you during the next ten weeks. Speak clearly and confidently, establish your credentials within the discipline, show evidence of organization and preparation, and take steps to start the quarter with firm, but gracious control of your classroom. Let your students know that you are there to enhance their learning. You will guide them through the material, but you are neither a crutch nor a substitute for their hard work.