limiting myself to his class. I am trying out all different kinds of stuff, american accent training, cartoon, radio.
the key is:
1. do it constantly, you may only do it 10 or 20 minutes, if you keep on doing it yo will see the result
2. you've gotta work hard on it regardless what approaches you are gonna try.

how successul you are depends on how bad you want the success
give it a 100% when you are doing it.