I mean, is it advisable to try to wake a friend up? What about the risk of he/she falling into depression? Anger? Fury? Any bad experiences?
The professional cult interventionists that I know say that an important part of their assessment when/if they decide to approach a person in a cult, is to evaluate the lives that they had before (family, friends, relationships, etc), as well as what awaits them outside if they leave.
I was surprised to find out that there have been cases when after having a session with relatives and the family of the person "lost to a cult", the psychologist's recommendation has been to keep the person in the cult. There are instances where the lives that people run from that makes them fall into the hands of a high demand, controlling group, are not that great. There are other instances when the person's mental health or state is not appropriate for intervening in their lives about what they believe, and without asking their permission (at the end of the day, that's what we are doing if we attempt to wake up another person).
People join organizations for a number of reasons, and sometimes those reasons have to do with sheltering themselves from difficult families or other elements in their lives. They feel safe, physically and mentally, in the cult.
Another aspect is mental health. I am not a psychologist, and I cannot assess when/if a person is in the right mental health condition to handle TTATT, especially if I myself have nothing to offer that person to replace what the cult gives them.
Personally, I don't attempt to help people out because (a) I cannot be responsible of messing with whatever happens after that person leave, and most importantly (b) I'm quite done with convincing people to change what they believe; that was kind of the point of me leaving the JWs.