1- Identify resources: Venus, Phoebe (Saturnian moon), M-class Asteroids, 13 Egeria (ice rich asteroid.
2- Build fusion power plant on Phoebe to power systems.
3- Place geosynchronous ring around Phoebe at 200 km above surface attached by cables.
4- Extend from ring 2000-3000 km light sail.
5- Build ion cannons(thrusters) with gimble on either pole of Phoebe using local material or M-class asteriod.
6- Use combination of light sail and ion cannons to break Phoebe out of Saturn's orbit.
7- Use combination of light sail and ion cannons to orient Phoebe and light sail properly.
8- Use combination of light sail, ion cannons, and planetary swingbys to navigate Phoebe to Venusian L5 point.
9- Assemble M-class asteroids (if needed) to L5 point.
10- Cover Phoebe with reflective surface to preserve ice.
11- Extend light sail to radius of 30,000 km and convert surface of light sail into a solar power panel.
12- Construct two hollow spheres 60 km in diameter (Phoebe II and Endymion). Store in sunward side recess in Phoebe.
13- Move sunward side ion cannon equipment to Endymion. Modify remaining Phoebe ion cannon to dual beam purpose (+ and -). Fill Endymion with fuel for the ion cannon. Cover Endymion with solar power panels to power ion cannon at reduced power.
14- Fill Phoebe II with material for the final ring and self replicating orbiting shade panel robots.
15- Construct a 10 km object (Trigger) of rock, ice and frozen CO2 and store on anti-sunward side of Phoebe.
16- Use light sail to move assembly to Venusian L1 point. Use Phoebe ion cannon to prevent light sail from pushing Phoebe to Venus. Power comes from light sail solar panels. Light sail will serve as a shade for Venus assisting in cooling.
17- Release Trigger to make an atmosphere grazing encounter with Venus in the opposite direction of planetary spin and an angle of 30 Degrees from the ecliptic.
18- While the ring of dust from the Trigger collision is still ionized direct the positive ion beam to the edge of the ring. Direct the negative (electron) beam at one of Venus's poles. Use power from the solar sail/generator. Homopolar effect will begin spinning away air at escape velocity and spinning up Venus in opposite directions. See image below . A self regenerating magnetic field is assumed. Preliminary research is needed.
19- As the ring grows and spins off air continue firing the positive beam at the edge of the ring. When one pole is obscured by the ring due to the inclination, switch the electron beam to the other pole. The turbulence in the air and the extended surface area of the ring will help cool the Venusian atmosphere and compensate for the electric resistance heating.
20- When enough of the Venusian atmosphere is gone and the day is short enough, turn off the ion cannon. Approximate time 100 + years. Final status 5-10 atmosphere surface pressure, 3 day day. Note-permanent planetary magnetic field, and global tectonics may be induced.
21- Allow what is left of Phoebe (mostly ice) to fall towards Venus in a trajectory that will put it into an orbit in the opposite direction of the ring. Optional-save the solar sail and the ion cannon thruster at the L1 point for more shading or move elsewhere for other work.
21- As Phoebe encounters the gas/dust ring the ring will be swept up and Phoebe's orbit will drop lower due to momentum loss from the collision clearing the orbit of the gas/dust ring.
22- When Phoebe is at the outer Roche limit release Phoebe II which will be the outer shepherding satellite.
23- When Phoebe is at an acceptable orbit release Endymion which will be the inner shepherding satellite. The ion cannon on Endymion will be used for weather control.
24- Phoebe will drop lower in the gas/dust ring until it contacts the atmosphere, breaks up, and finally collides with Venus releasing volatiles for the shallow seas. Considerable heat from kinetic energy release. Approximate ocean depth if Venus were flat is 30 feet. Optional-use the solar sail to retrieve asteroid 13 Egeria for water ice adding another 15 feet of water to Venus.
25- Release new ring material and self replicating shadow satellites from Phoebe II to form a remote controlled artificial shadow ring between Phoebe II and Endymion.
26- Venus is now ready for inoculation by biological agents to create a biosphere.
27- Rename Venus to Cytherea and Phoebe II to Phoebe.
Excuse the vertical ion beams. I can't get them to point to the ion cannon at the Venus parasol.