One of the things a person will notice is that magicians are all slightly paranoid. Sooner or later, we all undergo a bout of paranoia, believing that someone else is out to get us. It is one thing for an outsider to believe that they are being hexed; it is something completely different for a magician to believe it.
It is not something that you would expect logically from magicians. After all, we know how much work it is to actually target someone. We also know how pointless it is. There is a figure that is tossed around that 99% of psychic attacks are caused by people just thinking bad thoughts at you. Only one percent of hexes are actual "warmed up the cauldron, made thistle poppet, and poisoned their well" style cursing. And probably 99% of the actual curses are done by first year students---the more advanced students are too busy dealing with other stuff (like spiritual development).
So why are magicians so paranoid? Simply because by taking an active part in the creation of the universe (or at least how it looks right now), we know how fragile the universe is. That and if a magician thinks that the universe or someone is out to get them, the law of attraction (what you think about most is what you are going to get) is going to nail anyone that hasn't started to learn the real lesson of Daath. If you think that someone is cursing you, the magical mirror that is the universe is going to oblige you with signs and indications that you are indeed cursed.
The curse that most paranoid magicians recieve is the curse of thinking that they are important enough to curse in the first place. Everything else is a side-effect. And the guilty party is most likely the face that greets you in the mirror every morning.