I'm walking since 2010 on different ways in different seasons, short (100km) and longer (3100km) distances. I roughly slept in 450 Albergues/Gites/Pensions etc.. I personally never booked ahead, on purpose.
1st. I never know how the day will be physically.
2nd. I never know what the day provides.
3rd. I have to feel free and I like the idea not to know in the morning where I will close my eyes at night!
I met a bunch of people they were so busy with booking and looking for accommodation, that they were pressured by this and constantly thinking about it. I felt that they were strained.
I will never forget a guy from Switzerland he had booked his whole Camino in advance. He was obsessed by following his plan, he couldn't let it go, couldn't access to be on the way.....
He was earlier at home than the bouquet of flowers he also had ordered for his wife in advance, cause he got injured by walking to much.(following his schedule)
my punchline is, if you don't have to book (except age, illness, physically limited, etc.... also I know this isn't necessarily a factor, but could be a understandable reason for booking) then be open for what the Camino provides, let the magic carry you.
Cause of these circumstances I experienced uncountable feelings and unforgettable memories! I never felt lost or couldn't find a place to sleep.
I know that everyone walks his own Camino and that's good so!
Please nobody should feel attacked by my words, also English isn't my first language.