Don't let anyone tell you it's not hard. The Camino was designed for pilgrims, people who agree to challenge themselves and "step out of their comfort zone." The
Camino Frances, the one you're looking at, has the best-developed network of accommodations, so the trip between possible stopping-places is usually only a few kilometers. If you don't book ahead, you can stop sooner or later, depending on how you're feeling that day.... if you are not walking during a crowded season.
The albergues and hostels have wifi, but it's smart to have a sim that works in Spain, in case of emergencies.
All the advice, maps, accomodation descriptions and other details you need to plan your walk are available in easy-to-read form in any of a myriad of Camino guidebooks.
Wise Pilgrim is a good one (there's an app, too),
John Brierley's guides are a classic, too. There are many good choices!
Just remember this is not a great trail for a relaxing vacation. It's a pilgrimage, a journey of the spirit. It's meant to challenge you.