Here are three blog posts that explains how to navigate the AGN. Even for those who don't speak the language, it's not impossible to do family research outside the island, it is just knowing what is available and how to use it to your benefit. Doing genealogy is also learning the history, without the history you'll have a hard time finding what you seek.
Part 1
http://genealogianuestra.blogspot.com/2015/07/navigating-dom...Part 2
http://genealogianuestra.blogspot.com/2015/07/navigating-dom...Part 3
http://genealogianuestra.blogspot.com/2015/07/navigating-dom...