Paul's getting straightened out by Jesus was one refinement (that's in Acts). Paul then straightening out Peter was another one (I believe that's also in Acts). And Apollos was corrected by Aquila and Prisca (also in Acts). Jesus corrected the other apostles (that's in the Gospels), and the seven congregations (in Revelation, chapters 2 and 3). An angel told John not to bow before him (in Revelation). The governing body in Acts 15 gave corrective counsel regarding the matter of circumcision (while making a few other rulings at the same time). Paul wrote to various congregations and individuals to correct various situations, and the letters by John, James, Peter, and Jude did likewise. Many of the corrections in the NT came by new inspirations updating the applications of earlier prophesy.
So, I would expect much the same to take place today. We have assurance in Revelation that an angel "in mid-heavens" takes the lead in the preaching work. The WT publications are like an abundance of "letters" (perhaps new scrolls being opened, as mentioned in Revelation), so that we are well-fed spiritually and can thus make much-more-informed decisions, IF we actually take the time to read through and meditate on all the issues from cover to cover, with the effort required. End-time prophesy includes what is mentioned about the ceasing of some operations of holy spirit, so that has some bearing as to how things will differ today from in the 1st century. These thoughts have come readily to mind, and are hopefully in some reasonable semblance of order to the reader, whoever you are.