At the time, 6 years ago, when I knew I needed to take on the trans beast for real, my wife and I were starting a long distance marriage. I lost a job, got a job several states away, was alone, isolated, and waaaaaay too much time to myself. I reached out for help, eventually finding a TG support group. The first meeting (my first one ever in my life) totally floored me. The following month the same result.
My marriage at the time was not all that well. Add to that a chronically ill, often depressed, sometimes suicidal wife seeing no hope for her future. Not the sort of person you want to drop the T-Bomb on. Being open and honest was not exactly my forte. Yet I knew I by that time I needed to, but couldn't. By my third meeting I knew I needed to be there, that I belonged there, and that my wife absolutely needed to know before it was way past too late to tell.
It was a difficult weekend back home. When I first said "We need to talk later" she instantly went into "You want a divorce, don't you?" mode. She didn't see the T-Bomb coming, yet she handled it surprisingly well.
I knew I told her just in time. Any longer and things likely would not have gone as well.