I can do this
If I were Moses, I can't divide the waters of the sea, but I can stretch out my hand over the sea. (Exodus 14:21)
If I were the widow, I can't make the vessels produce oil, but I can go and borrow empty vessels from all my neighbours.(2 Kings 4:3)
If I were that little boy, I can't feed 5 thousands of people, but I can give Jesus my fish and chip(oops, I mean loaf).
If God tells me to do His will, I don't have to panic about the task: there's something I can do.