I knew TTATT for 3 years before I left physically. It was still a horrendous process and there's never a 'right time'. The repercussions were as serious as it gets and to be honest the anguish of attending meetings before knowing what I knew was nothing compared to the six months following our exit.
I would never urge someone to leave before they are as prepared as they can be for the fallout. You have to do what's right for your circumstances.