I'm doing this right now. Here's what I am doing:
1. Get your self a bilingual girlfriend.
2. Pick up a Spanish English dictionary and a general "Learn Spanish" book.
3. Listen to Spanish radio. Diez, siete pointe uno (107.1) is good and is diez, siete pointe siete (107.7). Both are in LA.
4. Watch Spanglish TV. There are some really hot chicks on these shows so it's worth the watch.
It's not enough to be able to hear the language. You have to speak it and see it in action for it to sink in. At least for me.
Suerte!