Starting in France sounds like a neat idea. I considered beginning in Bordeaux, but abandoned that plan due to the lack of a good map or guide for that region (I'm not an experienced hiker, either). Instead, after spending a couple days there prepping, I took the train to Bayonne for a day, and then to St. Jean, where I began walking the morning after arrival.
While on the Camino (in July-August of 2007), I met one person who started in Le Puy - a retired Norwegian man. What's wild is that both of his knees were
artificial! I was walking pretty slow at first, and not going far, so I ran into him quite often during the first couple weeks of my trek. Being of Norwegian stock, it was nice to meet a guy from the "homeland." He mentioned that the trail from Le Puy was OK, but it was so rainy that he found it difficult to do laundry because it wouldn't dry. Even hanging it from his pack during the day didn't help much.
One night, he slipped and fell down some stairs at an albergue, banging up his elbow and back. The next day I saw him at a cafe, and he was planning to stop and have a doctor look at his back. After that, I lost track of him for quite some time, and I was afraid that he'd been forced to abandon the Camino.
And then, two or three days outside of Santiago, there he was at another cafe! Since our previous meeting, I'd taken some break days along the Way, so I imagine that was how he caught up to me (he didn't seem like the bus/train type). He was doing great, even after falling down some stairs
yet again soon after the initial tumble. I hoped that I'd see him again in Santiago, but that was our last encounter. Even so, I'm sure he made it, since we were so close. I hope so, because he was a neat guy.
In case you haven't heard of it, here's a good book by a guy who walked from Le Puy to Finisterre:
Pilgrimage to the End of the World, by Conrad Rudolph. It's a bit dated, but a good read nonetheless.
Anyway, hope you have a great trek - buen Camino!