Rates are pretty good compared to some places...1.85 per mile and 5 dollar minimum. To prepare...learn your way around, the hotspots, shortcuts etc before you drive. I have no idea what Kittery is like but I know Portsmouth has Uber as well so I imagine you'll get a lot of people on both sides of the border. You might have to sign up twice, once for Maine and once for NH but I'm not sure. E-mail [email protected] and they should be able to tell you. Good Luck and welcome to Maine!