>step 1
launch 2-10 billion tonnes of nano-patterned silica confetti like wafers, making Venus emission spectra radiate in the wavelengths Co2 is transparent in, effectively cancelling 100% of the greenhouse effect, 70% of the atmosphere rains out within a year the planet is covered with co2 oceans and mostly covered with co2 clouds, temperature is now around 0 Celsius and pressure is 35 bar the entire surface of Venus can now be explored using deep see diving breathing mixtures. humans would colonise the summit of Maxwell Montes, here the pressure will be 17 bars and its above the cloud cover. habitats will be pressured to 2 bars and only need to deal with 15 bars of pressure differential, habitats will be covered in a enclosed large tent fill with hydrogen and oxygen breathing gas for a safety redundancy factor

there you go sci a new planet to explore, the silica can be launched by rail-gun within 2.5 years after first payload from mercury for 10 cents per kg or less. boom habitable for 100 bil to 1 tril max.