Sidehistorik
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Download Confluence from http://www.atlassian.com/software/confluence/download
Download the MySQL JDBC from http://dev.mysql.com/downloads/connector/j/
For the binary installer, JAVA is integrated, for EAR or WAR files this must be downloaded and installed separately.
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Follow the required steps (remember path to Confluence_Home and Confluence_Data) and connect to the tomcat instance started; if the MySQL Driver can be found, restart the Tomcat.
Postinstall
This is where the tweaking comes into place, to avoid common problems:
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