Install the Maven 2 plugin to eclipse europa is very easy.
- Go to menu "Help/Software Updates/Find and Install..."
- Choice option "Search for new features to install" and click next
- Click in "New remote site". Write in the name "M2eclipse" and "http://m2eclipse.sonatype.org/update/" in the url
- Select the option M2eclipse and click finish
- Select the result of search and unmark the options "Maven issue tracking configurator for Mylyn 3.x" and "Maven integration for AJDT".
- Click in finish button and after the download, confirm the instalation.