The thing is everyone does not need to change their mind, as they may already agree with God. For those it is not ABC but just BC, meaning believe and confess. I already knew I was a sinner, so I only needed the B and the C.
This is exactly why I do not like a one size fits all gospel presentation; because not everybody is the same. Not at all. And our brother has expressed it well by using his own life as an example. I was different: I needed to be shown I was a sinner and not some nice guy who could work his way into Heaven.So I am not saying no one should, but I don't mention Hell or tell them anything they have to do other than what Romans says which is believe and confess.
Some people know for a fact they are sinners; others do not. Therefore it is foolishness to try and convict a sinner of their sin when they're already wallowing in a hopeless sense of their sinfulness. But it is equally foolish to give the good news of Jesus Christ to those who have no sense of their sinfulness. Those latter are the ones who are likely to dismiss you because they see no need of the good news you are presenting.
My view is our gospel presentation must always meet the need the person to whom we are presenting. And we can trust the Holy Spirit to do that. He will lead us in the right way. Always. Preparation is excellent: we all need to know the basics of our faith and God's plan of salvation. But scripts just don't work...at least in my view.
However, the Holy Spirit knows the person to whom we are witnessing and knows exactly what they need. Therefore, once we have the basics in our heart, then when we set out to witness we should learn to trust in the Holy Spirit to lead...and to fill our mouth. After all we can only share the Word of God. The Holy Spirit is the One -- the ONLY one-- who can take that Word and actually convert the heart of the sinner.