Two days ago, I had a chance to speak by phone with US living manager.
I feel like I don't understand 50% of words.
His speech is like a mess.
At the moment I will be able to understand this kind of people I'll know, I have done a god job.

There is a fantastic site with short English lessons: http://www.engvid.com/
I've found it more than a two years ago and sometimes usi it for my free lessons

In addition to http://preply.com/ site, I hope it will give a boost to my listening understanddding