Joomla is a very popular CMS platform, however, it is too advanced if you are using it only for blogging purposes. I remember using Joomla initially before shifting to WordPress and back then it was a bit of a painful process.
However, if you are a Joomla user and are looking to move to WordPress, you can easily do it using using a Import Wizard or Migration wizard which are available as free downloads. You can download the import wizard for Joomla to WordPress from the links given below.
If you have trouble migrating, feel free to leave your comments. Since I have already migrated once from Joomla to WordPress I might be able to answer your questions.