I found this in the library and thought it looked worth a read. I’ve learnt, or tried to learn, German, French, Italian and Dutch over the years, all with a reasonable degree of success, as well as tinkering in some other languages with less success, but I wouldn’t call myself anywhere near fluent in anything other than English. I’ve read books in French but fall over as soon as I need to understand a native French speaker and that’s something that really annoys me that I’ve never managed to get over that hill. A lot of the advice the author gives here concurs with what I’ve figured out with my own learning style for the reading and writing of languages, which are the bits I find I’m good at, and I’m going to try his ideas for the speaking and listening bits I think, though I worry the problem might end up being that I just don’t actually like speaking at all!