it depends on how you drive. but search edmunds.com for all that stats.
Lower left hand side below gauges, switch says VDC Off. That will turn it off.
Check your owner manual. If you don't have one copy & paste this link. http://www.genuineservice.com/genuineservice/en/gloveboxresults
you've got to do a decent amount of work, they don't just pop off.. hve to unscrew multiple screws, some in wheel well and some under the hood. try this forum: http://www.g35driver.com/forums/faq-diy/81380-g35-sedan-headlight-removal-guide-3-simple-steps.HTML
It is behind the glove box, so you will need to take off the glove box and you will see it.