I know that I've mastered cooking a dish when I don't bother to take any photos of it because I know I'll be making it again just as well in the future.

Currently on the last military mission of Caesar 3, Lindum!  Sarmizegetusa (what a mouthful) was the misson before this and that one was definitely challenging.  Sarmizegetusa is a northern province which means wheat does not grow twice as fast as other crops -- meaning you need (roughly) twice the number of farms to feed the same number of people.  On the plus side, there are no risk of fires so no prefectures needed.

Sarmizegetusa has two major difficulties.  The first is that the farmland is really awkwardly placed -- in fact, most of it is on a narrow raised plateau that's unsuitable for any sort of larger housing areas.  There is one nice plot of farmland in the lower center area of the map, though it is close to natives which you'll need to build mission posts for.  I chose to use that area for my villa / palace housing, not sure if that was a wise or poor decision.

Anyways, this basically means you need to have a ton of farms up there on the higher ground and then a system of granaries which take the food and distribute it to the lower area where you can build your housing.  There's not a ton of open areas, and you need to fight constraints of having enough room, being not too far from the food distribution pathway, having access to water, and not being too close to the edges of the map, where the enemies spawn.

Speaking of the enemies, that's the second major difficulty here -- the Goths attack with an incredibly large force in this mission, which will overrun you quickly unless you're adequately prepared with walls, towers, and legionnaires.

Managed to get through all of it though.  Miraculously I even managed to evolve a small handful of luxury palaces (the highest possible level of housing) despite having a rather cramped space to place all of the service buildings in.