I really hate my accent.[really long story]

Guest:

Sure thing! But you must not repeat the sentences AFTER they are spoken, but SPEAK ALONG WITH THE SPEAKER--at the same time.

This is absolutely vital to reach the unconscious part of the process.

Be warned: Your jaw is going to hurt. Muscles previously unused will come into play.

Thank you Jasper...
I started and seemed productive...

Leidja, it's important to be patient. It will take many hours.

Have you noticed that your ear, listening while speaking along with the speaker, can hear those minute differences in accent?

Once again, patience will bring dividends. Practice, and let your subconscious mind do the work for you.