I’ll say that he’ll find his best successes with hive-minded insects like bees or ants right now, just in terms of being able to perceive the Formulae of their minds. As a Polymath, he’ll also have the potential/ability to perform fairly well in all other Majors, because that’s essentially the prerequisite you need in order to pursue Mesmerology as more than a meme. With no encounters with Edenic Beasts, he’ll also be a natural born Dynamicist, which is also pretty rare to begin with. Basically, the dude’s fame would easily stretch beyond Vienna, and he’ll only be held back by his choice of Major.

He’ll definitely be able to modify his own memories with ease, because that can easily just be a pure-Egoism feat. He won’t be able to transfer at all though. I’d say he can direct hive-minded insects to go places if he has their queen with him, and he can vaguely affect how aggressive vermin are.

I established Mesmerology as part of the world building and as a meme option. Those who can pursue it with any modicum of success will be extremely capable individuals though, while those who can’t actually succeed in that field are funny little trolls.