It will not help you if you want a technique that produces a proposal by Christmas. There isn't one, and anyone selling you one is selling you something else.
It will not help you if what you want is to be reassured that he will come around. This course will tell you what the evidence says, and sometimes the evidence is not what you were hoping for.
And if there is control, intimidation, or contempt in your relationship, this is the wrong resource entirely. The commitment question is not the relevant question, and you deserve support from someone qualified.
What it will do is end the not knowing. That is the whole promise, and it is deliberately the only one made here.