Westie
I find it helps a lot when you're surrounded by said language. You'll see the Czhech will become easier to understand. You'll even end up oicking in stuff you don't even realize you did. But that will take time and is not enough. I started watching English TV at a very young age, when I did not have the ability to grasp the meaning of the words spoken. Of course I watched cartoons only, but those use simple words and are therefore easier to understand. Reading books in Czech that you have already read in English might help too.
Good luck mate =D