I don't understand the question. When you are ready you are ready.
For me, I realized my marriage wasn't working for a while. I asked my wife to go to counseling. She refused. We got into an argument. I slept on the couch for a couple of months. I asked one more time if she would go to marriage counseling. Then I was ready. I got my own room in a temporary cheap shared apartment and I moved out.
Once I was ready to make the decision (which I really made before the last attempt to get her to agree to counseling.. although I would have probably changed my mind), it was pretty easy.
I have never regretted it.