Like the others said, believe you can and you can. That’s the key in Lucid Dreaming.
You might want to check out this topic which is about different styles of flying. It might give you some inspiration of how to fly. Also, this post might help you in thinking of ways to grow your confidence. TosxyChor stresses to take it easy and doing something that you already have confidence in. It’s your dream, you are in control.