Venus - like Mars too, is missing an essential element for terraforming: water. On both planets this is long lost, and the constituent elements, espcially hydrogen, is gone from the surface.
Unless there is a way to massively mine the rocks for the hydrogen and oxigen, there is no other way to terraform a planet like Mars or Venus. I am afraid that would put the terraforming efforts like hundreds of years ahead.
"More than five million cubic kilometres of ice have been identified at or near the surface of modern Mars, enough to cover the whole planet to a depth of 35 meters (115 ft). Even more ice is likely to be locked away in the deep subsurface." [1]
Unless there is a way to massively mine the rocks for the hydrogen and oxigen, there is no other way to terraform a planet like Mars or Venus. I am afraid that would put the terraforming efforts like hundreds of years ahead.