If you're listening to recordings, though, you obviously can't ask them to slow down. In that case, I would say you just have to keep on practicing. It should become easier as you hear it more. It may also become easier as you increase your English vocabulary. :)

Ask people to speak slower or find a tutor who lives near you.

I'm sorry: it doesn't matter if you are NOT watching TV...

I have done this almost all the time and I has been very useful for me: when you are doing anything at home, I mean eating, studying, reading or even working with your computer just listen a English TV channel, CNN in English for example, it doesn't matter if you are watching TV, just do things with your TV on. In a few time you will understand more and more. You have to used to your ears to the English pronunciation.