We are on the Camino right now in the super busy Sarria to Santiago stretch Our albergue is less than half full and as
@Walkerooni indicated, we are between stage towns. None of our non-reservable locations have been full and last night, due to some physical limitations, I booked the next 4 nights from here to Santiago without any stress or difficulty.
I have seen literally thousands of walkers each day this week and continue to be confident that if health permitted that we could walk all the way to Santiago without stressing about finding a bed and without reserving. It is about your comfort with the unknown and your confidence that something will be available. Look into yourself and decide what you can handle. If it causes you a lot of anxiety, then by all means book ahead. For us the stress of booking ahead is far greater than just walking until we are ready to stop for the day.