+1 on finding a shop that treats you with patience and respect.

+1 on finding a bike that fits you well (with the assistance of said shop).

It will be an adjustment from your Navigator. A road bike is lighter, has a shorter wheelbase and a steeper head angle, and of course the riding position is different. Just going from a touring road bike to a roadracing bike was a big adjustment for me when I did that. It felt very twitchy at first. I got used to it after a few rides. So will you.