We are currently a couple of turns (+/- 4) away from completing Liberalism if we want to. Currently, the best techs available to get as a bonus tech are Astronomy, Replaceable Parts and Nationalism. However I was thinking that it might be a better idea to research nationalism and constitution first, and only then research liberalism. We can then take Democracy, a very expensive tech, as our free tech. I think it isn't to difficult to do this, as it would take us about 17 turns to research Nationalism, Constitution and Liberalism. As Montezuma and Tokugawa still need Paper AND Education (and Monty needs Philosophy too) before they can even start on Liberalism, I think it's safe to delay Liberalism a bit to profit more from it's free tech. When we have Democracy and Liberalism, we can also make one big civic change to some of the newer civics like free religion and emancipation.