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I just did the maths here.
I'm assuming we want Venus a little further out than Earth to compensate for its thicker atmosphere and to avoid gravitational problems, but still in the habitable zone.
I'm also assuming that we're using Saturn V heavy launch engines, because I happen to know the stats for those.
It would take 4.678 x 10^24 kg of fuel. Weirdly and conveniently, this is about 95% of the mass of the planet Venus, including its atmosphere. In other words, rather than moving the existing Venus, it would be as easy to make our own.