If you speak another foreign language already, especially a Latin based one, it can really help with learning Spanish. Like most people who grew up in the UK, I was taught French at school, and whilst at first listen it sounds nothing like Spanish, it is quite similar both in grammar and in the roots of a lot of words. The accent and pronunciation is very different, as are the spelling rules, but there are many words which are basically the same, just following the pronunciation rules of each language. Some words are spelt identically, but pronounced very differently - 'jardin' (garden) for example. This means that it is often possible to guess the meaning of an unfamiliar word from a similar word in another language. It is also quite often possible to guess how to say something, although this will probably work less of the time.
More on this, plus a few examples, in the next few days