Hell yeah it is fun as shit! What's it like.. if you've ever done ketamine (so I hear) or DXM it has a couple similarities. If you've ever had surgery and worn a mask to get anethetized, that is Nitrous. Go to your local food store, or some head shops carry it. Ask for nitrous oxide cannisters (or refills for whipped cream dispensers), they are called whippets, but I would refrain from using that term in a store. Buy a hand cracker (or an actual whipped cream dispenser, like the ones at starbucks in the metal containers), buy a ton of those big punching balloons (seriously get a few, they pop sometimes, especially when you're just getting used to doing it). No it can not kill you at all unless you're hitting it out of a nitrous tank that is not cut with oxygen.

Have fun, hope this helps.