I've mentioned this before, but for those who speak Spanish the Eroski guides have good walking instructions, details about albergues, distances, etc. The website is
http://caminodesantiago.consumer.es/ , and there is a line on the right that says "Imprime y llevatela al Camino." By clicking on that you get a version of the guide that is printable. The pdf version of their Vdlp guide is 53 pages this is Sevilla to Astorga, so if you go on the Sanabres from Zamora you'll need to add those pages), but doing it double sided really makes it a manageable amount of paper.
I found the Eroski guide to be much more helpful than the CSJ guide, and the Raju Cicerone guide is very outdated. If I could read German, I'd buy one in a heartbeat, because I often got excellent information from Germans I met who translated from their guides for me. I know there are two strong sets of opinions on the German guides -- one is yellow and one is red, and each one has its strong supporters, but I don't know the differences myself. I think it has to do with the fact that one guide is too detailed in some people's opinions, and maybe other things as well. I think they are both updated annually, so either one would have good lodging and albergue information.
In my opinion, the Vdlp is so heavy with arrows and mojones that you really don't need a book with detailed walking instructions. Based on people's experiences there with the devastating heat this past September, I'd try to start in springtime if at all possible. I walked in May and it was lovely. I think April may actually be more crowded than May, since many have holidays around Easter and tend to start then. I'd jump at the chance to walk it again! Buen camino, Laurie