Brandi - of course I oftentimes ask myself those very same questions....and a few others like....can we really afford this? *small voice in head answers: YEAH yeah!*.

Seriously though, it is perfectly natural. I am almost certain after the first day on the tour, when you are done riding, you'll be asking yourself a different question:

Why didn't I do this sooner?~!

You'll be fine, believe in yourself and know that the jitters and questions are perfectly normal.