Kim, there are a lot of resources on the web and at your local library. I know it seems intimidating, but wet sanding is easy. Just use a block when possible, and be careful around ridges and edges. I wouldn't go less than 1,000 unless you have some serious problem areas to fix. Work your way up, 2500 is practically printer paper.
Really, look online and at the library, and don't be scared to try. Unless you really gouge the paint, you can always fix it.