I'm of the written/read type. The advantage you have with these skills is that you have all the time you need to acquire them. This was okay to me while I didn't have to interact with native speakers. When the time came, I found myself unable to interact (due to lack of conversational skills...)

The thing that helped me the most was chatting by msn with my coworkers (not cellphone). You have the structure of a conversation with read/write times. You also get the latest jargon and regionalisms in written. Don't overlook this useful resource!!!