I had planned to walk the Napoleon and had a reservation for Orrison. The afternoon before my first day walking my first Camino, I checked in with the Pilgrim Office in SJPdP. I was told there was too much snow on the Napoleon and the route was closed. It would probably be closed the day after that, too.
The Pilgrim Office contacted Orrison that I would not be able to keep my reservation and, the next morning, I walked the Valcarlos instead.
Not at all what I had planned - it was the end of MAY - but turned out well. The Valcarlos Route takes you through many dense valleys and woods, unlike the Nap. Flocks of distant sheep with tinkling bells against deep green pastures.
In spite of what I had almost always read here on the forum, you can get from SJPdP to Roncevalles in one day, even an out-of-shape, overweight, old lady like me.
BTW, I didn't have to sign anything confirming the advice not to walk. In 2013, however, there were many reports of pilgrims who ignored the advice of the SJPdP Pilgrim Office, walked the Nap anyway, and paid the price, both literally and figuratively.
I walked again two years later, this time got to stay in Orrison (Meh) and walked the Napoleon. The Nap was more crowded. You often feel like you are on the top of the world! You are walking on ridges above the treeline.
That first Camino becomes the benchmark against which all others are measured.
Buen Camino!!!