No human being, no matter how knowledgeable and holy, can ever succeed in such an endeavor. The best thing any human being can do is just get out of the way and let the Holy Spirit do his thing.
I was “almost” converted by the Vicar General of my Diocese, and at the time, I felt kind of bad for him, because I’m sure he was thinking what an honour it would have been for me to be brought into the Church by him at the Cathedral - but I just was not ready yet, and the honour involved was not enough to tip the scales.
Instead, I was brought into the Church a few years later by a quite ordinary diocescan priest, in a ceremony that probably was pretty pale compared to the one at the Cathedral that I would have received, if I had converted according to human timing.
I think you are right that conversion is a very complex affair - after all, it involves the whole person.
Someone who is intellectually converted to the Catholic faith still has his relatives and their emotional reactions to deal with, as well as some very concrete changes in lifestyle - going to Mass instead of to Protestant church services, and making some very radical changes in one’s social circle (as well as the inevitable change in status when you go to a new church - no matter who you were before, you’re low man on the totem pole, now - nobody really cares what a big shot Protestant you used to be; the best you’ll get is, “Well, thank God you saw the error of your ways,” but they aren’t going to admire you for anything other than the courage to convert.)