It’s a good idea to prepare your route every day, with a good topo-guide, and to figure out in advance where you can find food, drink (and yes, in France, it is not always easy to find grocers or bars open and even more so to find drinking fountains. You can find water in taps in the cemeteries!!!). On the other hand, in Spain, the topo-guide is not as practically essential, as the route is clearly marked.
In both France and Spain, it is easy to find a place to stay for the night.
Every day brings its fresh bundle of discovery and surprise. The meetings with people are exceptional, both along the way and in the lodgings. Everyone is very open and the quality of exchange is superb. In France, lodging in a private home is fascinating, because you get to share the evening with your hosts. By contrast, in Spain lodgings tend to be large gatherings of between 10 and 80 pilgrims. Even with the language barriers, the dialogues are so enriching you wish they would never come to an end.