My husband and I are slow walkers. We went during a very busy month when hostels filled quickly. You basically have to be off the trail by 1pm, as they fill rapidly starting at noon. We often stayed halfway between the
Brierley suggested stops and we booked a day ahead. If you book ahead, most hostels will hold your bed until 3. In the cities, Pamplona, Burgos, Astorga & Santiago, we booked two night hotel stays. We found that from Sarria on, we had to book the stops 5 days out, especially in Santiago where beds fill rapidly. If you are going in a slower month, you may not have the issues we did. Regardless when you go, it is wise to pre-book Orisson (or Kayola) and Roncevalles, as beds are limited in both places. We got into Roncevalles at 5pm and had to sleep in shipping containers. And, we were lucky to get those. Some people slept on the floor. Hope this helps...