This is a very common problem and much of the difficulty lies in the fact that many instructors just don't know how to retrain standard breeds - it's quite a specialized field. Many people disregard them because they are a bit more work in the beginning. This is why most people give up on them, because they get frustrated and professional help is hard to find.
I have answered this question many times over the last year or so (you're not alone!!). If you go back through my question archives you'll find it. The exercises are the same for your issues as the others. Good luck!!!