How to Switch From WordPress to Drupal

1. Install Drupal on your server in a separate directory from your WordPress install to prevent any of the core files from either CMS from interfering with each other. If you run WordPress on a WordPress-hosted site, you can install Drupal on the root directory of your site. Some hosts have a 'control panel' that includes a script setup program to install CMS platforms. If your site has this installer, use it to install Drupal, since it will automatically configure the database for you.
2. Log in to your new Drupal installation and configure the new Drupal site as much as you can. Set the name of the site to match your WordPress project and install a theme. Create categories that match your WordPress structure to ease the transition between the platforms; if you have a category called 'Puppy clothes' in WordPress, create it in Drupal. Mimic the structure of your site completely before migrating the content.

3. Install the Drupal 'Wordpress Import' module through the 'Modules' menu in Drupal. This module grabs all of the tables from your WordPress database and imports the information into the Drupal structure, creating all of the articles and menus that existed on your WordPress site. Download the package file from drupal.org and use the built-in installer in Drupal to add the module.
4. Click 'Modules' and then choose 'Wordpress import' to begin the migration process. Enter the information for your WordPress database when prompted. Then click 'Next.' The module walks you through choosing which categories to import and then moves your WordPress blog entries to Drupal.