Many are working on being trained. I don't think there is a list anywhere of those who have gone through any of the materials available from different countries (Canada, Australia). I would hesitate to say anyone is completely proficient at it yet - though I know several who are very good at it. Even with working on training materials, I would not say I am proficient at working in it. I can do it, but it takes longer than if I work with EBAE as my base language. NLS is working (through NFB) on putting together training and certification materials. Stay tuned for more info!
What, exactly, would you like to know about the CNIB course/exam? The course is 11 exercises. Once the exercise are completed (through self-study) an exam can be requested from CNIB. They send the test out (with instructions) and, if it is successfully completed, a certificate is available. This is for those who already know braille and there is no cost. I have taken this course/exam.
There is also a course/certification test for those who don't know braille yet. That course is a full course (about double the number of lessons) and costs $500. Once the course is completed, an exam can be requested and again, if successfully completed, a certifice is available.
If I have not answered all your questions, post again!