Lead a women's Bible study?

I was asked to be a co-leader in the women's bible study I have been attending for the last year. It's really, a small decision, yet, I am having a hard time making it. I really do not want to leave my small group. I love it. I really see myself as weak in leading groups. I'm kinda terrible at it. But, I was asked. It can be a way for me to meet and know more people. It can be a really great time of growth in my life. I haven't really prayed about it, I need to. I feel like coming to this place and blogging about what is going on is a great place where God speaks to me. Where He makes what I need to do known. But, I don't hear that voice right now. My overall feeling is indifferent. I think I should lead, it seems like the right thing to do. But will I be heartbroken if I do? Maybe I'll email The actual leader about my insecurities and concerns.