EasyBlog is already compatible. I recently made the same upgrade on one of my servers. Just make sure none of your components, plugins, modules and template are exclusive to 2.5. If they are delete them or upgrade them. If your template, components, modules, plugins all are Joomla 3.3 compatible, it will be a very easy transition.
Note, if you fail to delete any Joomla 2.5 exclusive component, plugin, module... don't stress. It happened to me, I forgot to delete one item... which resulted in a totally white page. What I did was I edited my configuration.php in the joomla root and changed: public $error_reporting = 'none'; to public $error_reporting = 'development';
Once I enabled error reporting I was able to see what component/module was a problem by reloading the website... After that I went into FTP and renamed the folder for the component or plugin which was causing the error. Once that was done, I was able to reach the administrator panel and fix the rest from there.
Good luck