Hello kate,
Please ignore the first paragraph in my message to you. I got some of the puezblos mixed up. The stages should be in the following order: granja de moreruela, tabara, santa marta de tera, mombuey, puebla de sanabria, lubian, a gudina, laza (or verin)., vilar de barrio, ourense, cea, laxe (lalin), puente ulla, sdc.
If you are walking, i would take the laza route instead of verin as it is shorter. However, if you have time constraint, i would walk to verin, a big town with transport connection by train or bus to ourense which is 108 kilometers from sdc. This will free up at least 2 days.