In my previous post, I referred to the page on the Confraternity's website. At the bottom of the Confraternity website page, you will find a link to the Barcelona group which produces a handbook on this route-- I think it is about 15 euro & is also available in French as well as Catalan.
Go to the mundicamino (
http://www.mundicamino.com) site, and click on Rutas, choose Camí de Sant Jaume (2) and the step-by-step menu will provide you with as good a text as you can find. These details are new and a great improvement over what was available in 2007-- it lists albergues and other accommodation.
The path is not well-marked as it is on the Camino Francese. However, with these maps and some local assistance, you will make it. Your real challenges will be the paucity of pueblos along part of the trail, the lack of fuentes for fresh water over considerable stretches, and that you will need to have enough Spanish to make sense of directions. It is likely that you will not see many other pilgrims on this route, and you should be prepared for considerable stretches of solitude, and that very few people will speak English. I have the impression that the Camino of 25 years ago was much like this.
Locals are not accustomed to peregrinos and you may find it useful to preface every conversation with something like "Soy peregrino coreense a Santiago." Some people may initially fear that you are a vagabond and I suspect that many will be taken back by meeting an Asian pilgrim-- they will not be hostile or negative, but they will be surprised. You will encounter much warmth and hospitality, but this is not a path taken by many pilgrims-- perhaps a only a few hundred each year.
There are few albergues along this path (Montserrat, the municipal in Jorba, convent in Cervera, municipal in Tarrega and Tamarite de Litera, and a new albergue in Linyola). Some places, such as Tarrega, offer student residence accommodation (Ca d'Aleix) or in local convents-- possibly there might be student accommodation in Huesca at the university??. In others, enquire at the ayuntamiento (Generalitat in Catalonia) or the parish church for assistance (or even the police!)-- a letter from your bishop or pastor might be very helpful, in addition to your pilgrim's credencial. If, as you suggest, you are taking this path from your interest in Saint Ignatius Loyola, you may have Jesuit friends prepared to write to any Jesuit houses or schools along the route, to secure accommodation for you. In other places, inexpensive rooms are available above cafes or restaurants, or you can take a room in a fonda or pension (these would be in the 15-35 euro range).
As I mentioned, there are so few pilgrims on this route that there is only a very weak infrastructure-- it appeals to those who do not need them and who have a sense of adventure. Still, Loyola made it! and without compeed!
so I'd like to walk the path where the Saint has walked 5 centuries ago. 
