How did Jesus accomplish the Second Creation (Resurrection and Heaven)?

Jesus Christ's work came naturally to him - he was not acting upon instructions. 

When he awoke to his divine creativity, Jesus knew what needed to be done - because he was a Man (as well as perfectly aligned-with God's creation); and he spontaneously realized that what Men needed to live wholly by, for and from Love; was eternal Heavenly life - that is, to be saved from evil, entropy and death. 

Jesus knew this for himself, and from himself. But partial notions of the idea were also (apparently, according to some historians) implicit in some of the ideas of his time and place; found in places such as the Hebrew, Greek and Roman religions. These may have been confirmation or a clarification, but were not the origin. 

All humans who grow up into the dawn of consciousness know implicitly what is needed for the purity and completion of our mortal lives; and so did Jesus - but Jesus knew it explicitly. 

And because Jesus was wholly-aligned with divine creation (this happened at the time of his Baptism by John), and motivated solely by love of God and fellow Men; what Jesus knew and willed, was thereby created. 

That is how divine creation works - without intermediary. 

(Indeed all true creation works that way. Once created it is directly - intuitively - available to all of good will, aside from communication.)

For Jesus; to know what is good, is to desire and make it possible.

Jesus began to teach that eternal resurrected life was now possible for Men who chose it, but to attain the perfection of Love eternally, they must die and be "born again". 

(And they must want to live by love, above all else.) 

However, it was not necessary that Men be told of resurrection in order for them to choose it. 

The soul after death had always moved to various states of Being after leaving behind the dead body (destinations such as reincarnations, or underworlds, or demonic affiliations), as hinted by the various recorded ancient religions. 

The Second Creation by Jesus now became available to the soul after death, including those who had previously died; as a new possibility - as a possible choice. 

(A choice never previously available until the work of Jesus; impossible to God the primary creator, and only possible to a mortal Man who attained complete alignment with God's Primary Creation.)

    

Resurrection to eternal Heavenly life thereby "immediately" became possible after its creative conception (without need for Jesus himself to die and be resurrected); as was shown by the resurrection of his "beloved disciple" Lazarus. 

Jesus them demonstrated how things could be, by his own resurrection and his temporary return to work among his disciples, and many other people. 

But the Second Creation was made for all the Beings of the First Creation who desired and chose it, post-mortally - not just those Beings who had heard about it, and not just human beings.