When agriculture was first introduced in history, what were the complexities?

The introduction of agriculture, sometimes called the
Neolithic revolution, was a crucial change in the human experience.
Some would argue that, other than the emergence of the species itself, the development
of agriculture and the later replacement of agricultural economies with industrial
economies are the two key developments of the human
experience.

By 5000 BCE, agriculture had gradually spread
and was becoming the most common economic system for the largest number of people in the
world. Despite the advantages of agriculture over hunting and gathering, its widespread
adoption was slow.

One reason for this slow spread was that
contacts among relatively far-flung populations were minimal. Also, not all regions were
suitable for agriculture; some were heavily forested or arid. Last of all, agriculture
involves settling down, which might not have been attractive to some
hunting-and-gathering societies that treasured their capacity to move
around.