The facility, finesse, care and yes, luck, to successfully extricate a family unit from this high control association is a unique skill set. There is no instruction manual because there are simply too many variables, not to mention that the awareness, the need to depart, also comes gradually.
Of course, if both spouses see reality at nearly the same time, fading or leaving becomes a coordinated effort. In my own case, reading a single chapter of CC online was enough for me to instinctively toss my 1956-96 "Watchtower" and "Awake!" volumes into the dumpster, up to that point my single most valued possession.