Hi Lyndee Lou,
Your questions and concerns are familiar to me, as I had some of the same questions and concerns before I departed the USA for St. Jean on February 7. I tended to plan trips in detail, leaving little to chance -- in hopes I would then be able to relax and enjoy the journey, the experience.
I don't mean this in a sarcastic or dismissive way. Planning every little detail was my way of doing things.
... and then my camino began ... and changed my way of doing things.
My days became simple: clean and prepare my feet, start walking, stop to rest when my body signaled it was time, take every opportunity I found to greet and engage people in conversation ... day after day. My need to plan every detail lessened, then disappeared.
That is not to say that I left all to chance. I carried with me an iPhone, which provided me basic Google Maps (which helped me find my way off cow trails after becoming lost between Portomarin and Palas de Rei), Google Translate (which helped me communicate my questions, needs, and compliments to people who spoke at least six other languages), and Booking.com (linked to this forum, which helped me find lodging when I needed to stop where an albergue as not available or was undesirable on a given night).
The Way is well traveled (has been by millions of pilgrims) and it would be difficult to find oneself in trouble -- as long as one does not ignore the weather or one's physical condition.
I walked in February and early March, when many towns appeared vacant and facilities were few and far between -- and yet I never had trouble finding a safe, clean place to sleep or eat.
The pilgrim office in St. Jean will provide with your credential a list of albergues that are open when you walk. Plot the locations on the topographical profile they also provide, and note the towns where no albergues are open (fewer for you than me). This forum provides a link to hotels along the
Camino Frances, through booking.com, which was extremely easy to use with my iPhone.
You should be fine. Try not to worry (too much) about your camino. The Way is well known and populated by many people who look out for pilgrims. Listen to your body (mostly your feet), pay attention to the waymarks (mostly yellow arrows, stacks of stones, or shells), and be aware of distances, and the walk should be relatively easy.
Good luck and Buen Camino.