I guess some of this is also, to what level do you need to learn German? Some of the parts of German grammar that are difficult for English speakers can be mostly avoided by just phrasing things differently. Basic use of cases is necessary, but some of the rules around compound sentences can be skipped at first by just using simpler sentences. If what you're after is a reasonable conversational/email level of German, that's enough for many things, and you can always learn more constructs later. If you want to be a professor in the humanities and need to write/speak a formal academic level of German, that's different, but that's probably not the common case for HN readers.