I taught myself linear b one summer - it was a hard slog, as although the characters are clearly motivated (ie simplified pictures, presumably acrophonic) there are a lot of them and it's in most cases not clear what they are of - and even if it were, it wouldn't be much use to you as the language is unfamiliar anyway. If current theories are correct and the characters have the same values as in linear a, and linear a is not Greek, then the Mycenaean scribes would have had similar struggles learning the script as I did, which increases my respect for them!