I agree with willowyman Da'ing was always seen as the really bad thing, that only someone haughty and that had rejected Jehovah would do.
I think that in view of the WTS's ne policy, as soon as you know you no longer can stand going to meetings etc, you should write a letter or make a phone call to your JW freinds before they suspect anything, and explain why you are taking this course, then when it is announced they will fill in the rest as to why you are no longer a JW.
IC