Please (por favor), thank-you (gracias), good morning (buenas dias) are not difficult to learn. If necessary, carry a cheat sheet with you or a dictionary. Many phones, iPads, Kindles, and computers have dictionaries on them, some with pronunciation.
Carrying a dictionary for other languages may be helpful. People from all over the world walk the Camino. You will meet Italians, Frenchmen, Germans, and Asians. Having a way to communicate other than pantomimes and charades, makes the Camino more enjoyable.