When it comes to releasing an EP, album or festival schedule, employing a press officer can be a real bonus. The press officer's contacts, media knowledge and relationship with journalists guarantees much higher exposure than if you try to do it yourself in isolation, with none of the right contacts.
This can obviously cost anything from a few hundred to several thousand euros, depending on the size of the project and the promotional campaign. Contact several press officers and weigh up the pros and cons of their costs against projected benefits.
But be aware, promotion is not an exact science! The press officer's fee does not guarantee you'll get any media coverage. So, contact someone who's been recommended to you and who has a good reputation in your particular musical genre. Personal recommendation is often the best.