Yes, I've done small parts of the route on two different occasions. First time I quit due to problems with my feet, the second time I quit after problems with the heat :-)
I never planned to go the full camino, as most of these routes are quite long. The one that starts in France is about 800 km (500 miles) I think, so that will be a full summer holiday and probably a few weeks off work at best. Not ideal to walk during the height of summer either, as the heat can be brutal.
If you have particular hot spots, I'd also recommend applying some foot cream like Trail Toes. I always use it for runs over ~30km.
All I wear is hiking labeled socks from sports stores. Greatly reduces wrinkles even if you go for the cheap ones. (Decathlon's store brand for example, but that's EU only i think).
When I (not parent) went to the Camino de Santiago, I was already an experienced hiker (I could certainly walk 30kms in a day and I had done it many times) and I brought a good pair of shoes with me (that I used before without getting any blisters).
But my feet were just not ready to take 30km per day for many, many days in a row. It's one thing to do it just during weekends, doing it every day is a different beast.
Eventually it got better, but it took a while for me to get used to it (and a whole lot of Compeed plasters).
My advice for anyone who is going, would be to start gradually (maybe 10-15 km/day) and then over time go for longer and longer walks.
Edit: I totally agree with the sibling comment about socks being just as important, if not more, than shoes
Blisters happened at the beginning. Investing in Darn Tough socks helps.
Thanks for the advice. In the army we got the opposite advice, they said we must never use woolen socks when we did the 30 km march, always use cotton they said...
That is some serious distance. I remember thinking I would be able to do at least 25-35 km per day, a few years ago when I walked parts of the camino de Santiago in Spain. Blisters and destroyed feet in just a few days, not ever reaching 30 km per day I think.. How long did it take you to get used to this kind of distance daily?