I walked the Le Puy route alone and genuinely never felt uncomfortable or in danger. Locals (mostly women) would sometimes express concern for my safety ("don't you feel scared!"), but never my fellow hikers or hosts. Of course, you're never really alone on the Camino, I was never further than a couple km from the next pilgrim.
I speak French, which helped a lot, but it had been a long time and my French was pretty terrible. All the locals I met were extremely friendly and patient with me! Most of the guide books for this section are in French, but the
Miam Miam Dodo (the most popular guide) has all of its listings marked with symbols for easy understanding.
The signage is a bit mixed, as each district along the route maintains its own markings. They all use the red and white stripes, some towns paint them on trees, other towns have more permanent metal signs.
BUT! I found Le Puy to have better markings than the
Camino Frances (No one is going around with a spray can to reroute lost pilgrims towards their business, for example.)