Grammatοphobia?

I've been studying Japanese for a few years, passed all the JLPT級　and shit but I still don't know how to use は　and が　properly and how （「～が（し）たい」 and 「～を（し）たい」 are different.
So, I googled those in Japanese and I got some pretty convoluted explanations that helped me tremendously. I still need to do some reading (just bought a book that focuses exclusively on は　and が), but I'm pretty sure I'll have it nailed soon enough. I think I might even start studying grammar from scratch using Japanese grammar books written for Japanese speakers.

So, why don't textbooks geared towards foreigners/English speakers supply that information? Are foreign learners supposed to develop a sixth sense and figure it all out by themselves? Are they afraid they'll scare off people with heaps upon heaps of text?

If by "just bought a book" you mean "I downloaded it from Rapidshare", could you provide me with a link?


Also, you could read "All about particles", it's useful.