There's plenty in life to worry about, and swine flu is certainly no reason to isolate yourself from the rest of the world. But depending on the severity of its spread, and upon your own general state of health, you may want to avoid large crowds or situations that will put you into direct contact with many people.
You don't have to be a hermit, but you may not want to be a social butterfly either. If you catch swine flu, it will most likely be the result of standing within a few feet of an infected person, or picking up the virus from a shopping cart, door handle or other such shared surface and then touching your eyes, nose or mouth.
If you have a weakened immune system, are pregnant or have other health issues that may make you more susceptible to illness, you'll want to take precautions when out and about in public. Steer clear of sick friends and relatives until they're at least a week on the other side of their illness. Listen for school closures, not only to protect any children you may have, but to stay aware of a possible spike in flu transmission in your area.
You won't have to be a hermit in a cave, nor should you be (unless that's your thing). So when you do go out, just remember two very important things: Wash your hands frequently with either soap and water or hand sanitizer, and don't touch your face!