When looking at the list of possible job assignments Aziraphale had been rather lost until he spotted the option of librarian. Most of the other positions seemed to require either skills or levels of patience he did not posses (at least not in the face of people in a 'customer' position). Taking care of the library had seemed close enough to his previous occupation that he was easily given the role.
He had thankfully been given a grace period to adjust to his new surroundings. And his newly human body and it's more persistent needs and altered centre of gravity.
Since starting to actually work a few days ago he had not encountered any of his fellow inhabitants in the library itself. Instead he had been contentions himself with completing a total inventory and condition check on all of the books. He was rather loathe to lend any of them out, although he had been distracted by several of the volumes he had not previously encountered.
It was a just such a moment, bent over one of the rather large selection of reference books on a wide range of topics, that he had his first encounter with a patron. Who he hadn't heard approaching. His senses were somewhat lacking now he was human. He jumped as the books hit the desk.
His hand also jumped, in its case to his heart.
"Oh, I say," he said in surprise and leapt to his feet. The books were rather haphazardly spilling across the desk, but he was rather more concerned with the young woman who appeared to be the originator of said books and their slightly harsh treatment.
"I only just, that is to say I only began working here this week," he said. "I'm Aziraphale, a pleasure to meet you," he added after a second, his manners not reasserting themselves enough that he also held out his hand. He tended to forget he was allowed to do that with women now too in any case.