Bluetooth and navigation for 2004 G35

[gmissad]

I'm somewhat new to this forum and just bought an 04 G35x after owning a '96 Q45 for many years (which I loved). I was hoping to get some help on a couple of topics.

1. I know that this model came with the option of a navigation system. Mine unfortunately didn't but wondered where a good place to pick one up used might be. I looked a little on ebay but wondered if there were other better places. Also, is this something a dealership has to do or can you do it yourself?

2. Did this model in 2004 come with a bluetooth option? If not, is the next best thing a portable bluetooth that clips onto your visor or something?

Any help is greatly appreciated. This place is great.