Lately I've found a wealth of encouragement from this Every Day Language Learner post, Language Learning Tip: Using Parallel Texts. I have several books of this type, mostly German (Grimm Märchen, poetry anthologies and collections by Goethe and Rilke), but also a Gàidhlig collection of folk tales and Robert Henryson's The Testament of Cresseid in Middle Scots. Moreover the internet is chalk full of ways to synthesize the concept. In the past, when faced with an intimidating swath of foreign language, I've taken the machete-through-the-jungle approach, with minimal glances at my mother-tongue translation, convinced that the effort of immersion should be assuaged by English as little as possible.
According to Aaron's post, this is not the best way to go about it. He suggests first reading a portion of the text (as much as a single sentence to a whole chapter) in your native language, gaining an understanding of its meaning, and only then taking on a chunk of the target language. This way you spend little if no time looking up individual vocabulary words and have much more contextual or narrative meaning to assign. It also helps clear up idiomatic difficulties and generally keeps you going further longer. This concept has already been at work when I've read sections of the Bible, Harry Potter, or any of the Narnia stories because of my background knowledge.
Since reading this article, in addition to feeling good about being placed in the "Intermediate" category, I've barreled through no less than four Grimm stories with an extremely high comprehension and retention. I've discovered that this method is much more difficult with poetry given the high level of abstraction and grammatical anomalies (although my dreams seem to be haunted by Klopstock's Das Rosenband). My greatest joy has now been to read Friedrich Motte Fouqué's Undine in English, a fairy tale greatly admired by George MacDonald. I had bought the little yellow copy of the story in German while in Leipzig last year, but have always felt as if I should be much further along in vocabulary before I stumbled through it. Now, having read it once over in my mother tongue, to great satisfaction and joy, I am well equipped to take a stab at it in the original. I hope to use this same idea to get through my languishing copies of stories by Kafka, Ende's Neverending Story, and Goethe's Young Werther.