It has already been discussed that having sharp scissors is one of the most important things that you can do to make your sewing life a bit easier. Maybe the second most important thing to do is to have sharp needles. Sharpening a needle is a bit less common of a task than sharpening scissors, however, so in case you weren't sure how to do it, all you need is a little steel wool.
With the help of steel wool you can make sure that your needles are kept sharp and ready to use. This will also help to make sure that your fabric doesn't get snagged in the sewing process.