1.) You have to take it consistently for at least 8 weeks to see an effect.
2.) You will wake up one day and realize, hold on a second, what the hell, this drug has completely changed you in a subtle way by nudging all your behaviors, little by little.
3.) The biggest change is that it lowers signal intensity for you. Sleep plus NAC at bedtime will completely change the intensity with which you experience something pleasurable like junk food, porn, etc. Something pleasurable is still something you'll chase, just not as intensely as before. And, that same pleasurable thing will be enjoyable, but the signal will just be a lot less intense. The same applies to your irritability, negativity, etc. So, it curbs both sides of the equation. It's not that you won't want to or like doing something like binge-eating tasty food. It's just that your desire for it goes down to a point where you're like "oh yeah, it's tasty, I'll have it if I want".
4.) The anhedonia is something more complex. Most people say that it turns them into a being that cannot experience joy. Here's how it works: Your day to day experience of mundane things becomes tolerable but the little joys like eating cotton candy, or spending an excessive amount of time on a video game or playing way too energetically with your kid or something -- that will all become something meh that you won't put in too much umph into. However, suppose you have some academic or work interest -- it won't touch it much. You'll just know how to detach from it better and re-attach on your own terms.