Experiencing a little pre-tour jitters is probably normal. At least it is for me. IMO, if you are not excited about a tour, it is probably not challenging enough. In my experience, preparing for the tour, and getting to the start produces most of the pre-ride anxiety. It dissapates as soon as I get on the bike. I think it is from having less control during the prep and and travel prior to the start is part of the reason.
Enjoy your ride.
P.S. If you get bored, try the 75 mile loop that I think I sent to you earlier. I'd resend it to you, but I'm on a tour right, and don't have access to my computer

Yes, I had the jitters before the start!