Sports Sedan at 18, what do I need to know?

My father bought a new G37 coupe and is handing me down his 2007 G35x Sedan.The car has 306HP, and a 0-60 of around 5.7 seconds it seems. Look at what I drive now..... a 2013 Legacy. I've never touched anything close to this HP before, and to be honest, I'm kinda scared of it.What tips would you give to someone who just got their (reasonably) high performance car? via /r/cars http://ift.tt/2sB04eZ