I've done Rome, Paris, and Florence by myself. I too was afraid. I speak French and taught myself some Italian (I speak Spanish and Portuguese), this made me a bit more comfortable. I studied the areas and "memorized" the maps. I took a very calculated risk and had a ball. An easier alternative is taking a tour from the US. There are numerous trips, some for singles, others that take you cycling through Tuscany, and vineyards in France and Italy. My outlaws have gone with a program called "Viking Tours". They fly to the location, meet the tour, jump on a a river cruise boat and tour the area. One of their favorites was down the Rhone river. The tours are quite safe and you can meet interesting people.

Don't let fear keep you from celebrating your special day. It only comes around once a year.

Good luck!