Other people are giving good advice, but you should also know that it isn't that dangerous. People have died from the fumes, but only when they have a lot of dry ice in an enclosed area (e.g. a car). It can cause explosions, but that's mostly from people going out of their way to build bombs. It can cause burns, but not instantly and the pain will warn you before you get seriously injured.

Don't be particularly afraid. It's not hard to handle.