Understood, however, we must walk before we run. Mars will be our training ground. As far as cleaning and spiffing up Venus.....well, that sounds like a HUGE amount of terraforming. If we could normalize the atmosphere, what is the predicted surface temperature supposed to be?
The planet must be moved to an earth Lagrange point, and it must be provided with a moon. Mercury would be excellent in that role. Mercury is also a mining industry motherlode. Double bonus. Of course at this time we are unable to do much of anything on the moon, or even to capture an impact asteroid should one be coming our way. We don't have any capability to work in space, and we should get to work developing that capability. Venus is longterm, and we have a lot of technology to develop.