I'd like to know whether there is a way to know how to divide a word into syllables, other than by practice, by seeing them divided once and again. None of my two dictionaries show these divisions, and in almost every book I read the text is justified in a way that avoids breaking words. So, if it depends on my seeing it, I will never learn how to do it.

I've found an old thread in these forums about this, and from the messages therein I've gathered that the syllable separation is more or less related to the pronunciation of the word. However, this is of no help for me, since as far as pronunciation is concerned, I'm at a loss (I can see the phonetic transcripcion of a word and know more or less how it should be pronounced, but most of the times I see a word in a text I don't know whether the vowels are short, long, etc.). So far the only "rule" I've been able to learn is that when you get two of the same consonant together, the word is broken between both of them (they also said it in the thread I've mentioned). Are there other rules like this?

Thanks.