You are going to be a birth partner for your partner? Be confident! You know her best! You will know your partner better than anyone else in the birthing room. This should make you confident. You know when she is doing well, when she needs reassurance, when she is thirsty etc. Trust your instincts and your relationship. Listen to her, look at her closely and support her when she needs it. Follow her lead. The two of you will know best what is best for her, your baby and yourself.
Childbirth Educators: Please check out my website full of teaching activities, posters and banners.