After about a week it gets both easier and harder. Easier, because you don't feel like a piece of shit all the time. But harder, because you don't think you'll feel bad at all if you slip back into it. Semen retention is pretty incredible, so be ready to feel like a god some days, and hit lows on others. Sometimes you'll flatline and still feel better than you did, but wondering where the nofap high went. You WILL change. Your confidence will start to peak to levels of maximum smugness.
Do it right and you'll get /fit/ - working out helps a lot, just be careful not to conflate physical euphoria with anything sexual.
Bookmark /nofap/ and keep it as a lifeline.
Keep electronics away from your bedroom as much as possible.
Pick a book to read while you go through the process of dumping porn, because it takes a long time and you'll need a new distraction.
It can help to get addicted to something else a little less destructive, and then break that habit after making nofap a part of your life. But I'd only recommend that one to a particular sort of person, so you'll have to judge yourself honestly there.
Perhaps the greatest feeling I get is some sort of really strange nostalgia at unexpected times. I could be sitting at work, driving home, working in the garden, reading on the couch, wherever really, and suddenly I will feel as though I'm having deja vu backwards in time. That feeling where everything has happened before, but further back, pluperfectly; like a piece of myself has jumped out of the past, where I lost it so long ago. I think of it as pieces of my mind that were overwritten years ago by pornography that are now resurrecting themselves. That feeling alone gives me the strength to go on, the complete peace and sense of belonging, and that I am on the good, but tough road. I don't know if other nofappers get that feeling though.