concerned about going aggro

I guess it depends on the person, how they handle stuff when they are put to the test of quitting an addiction.
In my own personal experience, I have not experienced any aggression from nofap, but of course sometimes frustration can come to you when you really want to jack off or watch porn but you have to realize it's because you have gotten too comfortable because porn is basically one click away, but just get busy with doing stuff, go to the gym or workout at home, use the time to work or whatever just so you don't get bored and don't relapse.

Maybe you shouldn't think about it too much and it'll be fine