idk I just kinda did it
making a clear decision is important, because if you just kinda think about quitting porn, you will succumb and say "maybe tomorrow" if you get horny
maybe give yourself a realistic trial period: don't watch porn for a week and then decide if you want to continue (e. g. by not watching porn for 2 weeks or a month) or quit
don't dramatise your problem - I think that's why so many religious and no-fap people struggle: it's literally just a bunch of pixels, you should have control about the things you decide to look up; there's no devil tempting you to do things, you probably watch porn out of habit
also, I'm only talking about quitting porn: quitting fapping is a completely different story, because there's a physical factor
after masturbating to mental imagery (before falling asleep) for a while, you should get good at it and never look back - I've tried watching porn again a few times, but it was really unsatisfying compared to my fantasies