If we put a giant sunshade at the Laplace point between Venus and the sun, we can cool Venus a lot. In principle we can cool it all the way to the cosmic background radiation temperature (about 2.7 Kelvin). But we don't need to. If we cool it only "slightly" we can get it to the point where CO2 freezes (about -78 degrees Celsius). Since 96.5% of the atmosphere on Venus is CO2, this results in a memorable snow event, that could probably last for a few months/years. After which, the pressure on Venus will be about the same as the pressure on Earth. The chemical composition will also be about the same (most of the remaining 3.5% of the Venusian atmosphere is Nitrogen). The temperature will about as low as the lowest in Antarctica (last year the it was -76 deg Celsius there). Of course there wouldn't be any oxygen, but one would be able to walk around with an oxygen mask and just very thick clothes, like the ones people use in Antarctica.