I would recommend taking a transcript of dialogues or hearing files with hearing text. You read them as the native speaker speaks one by one. Thus you know the pronunciation of the word been spoken and the you can simultaneously try to understand the meaning of the words you don't know the meaning of. But i would still recommend for listening skills you learn lots of new words and the exact meaning of the words, at least when you are a newbie.
Listening skills development involves concentration and an ability of summarizing and guessing meanings. You need not understand the exact speech. This is one of the tips usually an interpreter will give and a very important skill. You understand and are able to work with very less hassles and are praised for your work. You also enjoy your work and have lots of leisure time.