What does "I had cut my eyeteeth" mean? [closed]

What does "I had cut my eyeteeth" mean? And how can I translate it in Italian language?

A sample text is as follows:

As an intelligence officer, and even before that as a young student in the course of my studies at the British Museum in London, I had cut my eyeteeth on all of them, plus a good number of others with whom I imagined Americans were familiar.

In English, an eyetooth is a canine tooth in the upper jaw, and a baby "cuts teeth" when teeth initially emerge in the baby's mouth. Figuratively, "to cut one's eyeteeth on X" means "to become familiar with and adept at dealing with X very early in one's life or in one's professional development."