Books like Blas na Gàidhlig really dissect the sound system in a lot of detail. I know this helps some people. The sound system is so regular (even if it seems a little scary at first) that generally patterns will start to become clear with repeat exposure. I hope helps even a little. We could look at adding more character challenges to the course in future to help. Stuff like this is probably beyond the scope of the notes as there is limited room I think.