I'd say go for it. What have you got to loose. If you land a few families that will be wonderful. If not all it cost you was a little bit of time and legwork. Plus, by planning a curriculum now it will give you something to work with during long school breaks and next summer, if you feel like still pursuing it. Plus, it puts your name in people's minds. Especially during the school year, if they could use a French tutor.

Sounds like you already have your mind made up. Don't let anyone discourage you. I think you were just looking for some reassurance. As someone who often takes big chances, I'll give you those words of encouragement.

Happy Summer!