Have you ever tried learning pronunciation through videos?
Youtube brings thousands up to you. Try seeing some and practice together with the videos and you will see how much you can learn from that.
The videos below are Rachel’s English – American English Pronunciation Guide. They show how IPA, o International Phonetical Alphabet works. I have written a post on IPA some time ago. Have you read it? IPA
[youtube http://www.youtube.com/watch?v=c97xwLdSsXU]
[youtube http://www.youtube.com/watch?v=4cU9fqpCqBA]
[youtube http://www.youtube.com/watch?v=dx3bzXwobTs]