Jan - Get a PLB, lifejackets, and go with someone who has done it before. Provided you are in a machine without a known history of unreliable running, or a poor maintenance history, and you fly as high as you are allowed, then you'll be fine and I promise you'll enjoy it. I find I feel safer giving regular position reports to London Information, and to get onto Lille quickly when I cross the boundary.
If you fly a two-stroke weight-shift, take something else.
You'll love France, they do GA in the the most wonderfully friendly and easy-going way. I'm now used to being laughed at when asking where to pay the landing fee. French club aviation is just fantastic.