Titan has some unique advantages such as its abundance of nitrogen and water ice. Although Titan can sustain an atmosphere, it is extremely far away from the Sun. If giant mirrors were put around Titan, dramatic changes would happen to the environment. The methane is a greenhouse gas boiling but can easily get lost (unless artificial gravity were to be added). There are rich amounts of ammonia below the crust. Lots of ammonia would have to be erupted by the cyrovolcanoes to warm the satellite even more.
Oxygen and Greenhouse Gas IntroductionEdit
It is possible to generate oxygen from silica and water, which are the primary components of Titan. By introducing enough Oxygen, it may be possible to allow humans to breathe on Titan without much modification, besides adding an immense amount of heat through greenhouse gasses such as: SF6 . However, SF6 poses two main problems. Firstly, Fluorine, the main component of SF6, is relatively rare. Also, SF6 freezes at −64 °C, whilst the mean temperature of titan is -179.15 °C. That means that any SF6 added without warming Titan previously, would fall down as snow. Another possibility, is to add NF3 instead of SF6. It is somewhat easier to do, as the atmosphere of Titan is almost entirely composed of nitrogen. Any F2 released into the atmosphere would react with N2 and form NF3. However, that does not eliminate the need to search for fluorine. Unlike SF6, NF3 is not inert. Also, NF3 is liquid at -179.15 °C.
Titan's crust is completely ice frozen to the point where it becomes similar to land. Underneath this is potentially a liquid ocean, and underneath that is an ice mantle. If the temperature raised to allow for liquid water on the surface, either floating platforms would have to be established, or potentially the establishment of artificial continents. The latter would be very difficult as you don't get to silicon or any other similar substance till you get to the core (which itself is silicon oxide).
This would also rule out importing of all terrestrial lifeforms as well as the vast majority of aquatic ones which somehow rely on the sea floor (unless you build an artificial one).
A possible solution may also be to add floating cities. This may seem probably as there is no dry land.