Quickly add Bootstrap to your project via the [Bootstrap CDN](http://bootstrapcdn.com), graciously provided by the [MaxCDN](http://www.maxcdn.com/) folks. Copy-paste the stylesheet `<link>` into your `<head>` before all other stylesheets.
Then, add the Bootstrap JavaScript—and jQuery—near the end of your pages. It's best placed right before the closing `</body>` tag. Be sure to place jQuery first as our code depends on it.