I have a feeling I am going to be saying the opposite when I get my tanks to 50 and beyond. Despite the many DF queues I have done as healer, I am as nervous as day one when I do. I have saved instances as healer, and received all commendations. Yet, I still get nervous. And it's for the very reason you stated. Everyone's lives are in my hand, and heavy are the hands that hold the heals.
I am really hoping that I can develop more confidence through tanking that carries over into healing. My lack of confidence as healer holds me back, and sometimes I feel like I'm just a keyboard kitty. When I'm confident though, I feel like I own the instance.
