Blocksite is good, just put nofap as the page that pops up when you enter a site that you wouldn't enter. NSFW blockers in the end, won't stop you, they are just there to give you another layer of though. Because maybe you are ultra stressed -and all the other factors that usually induce a person to fap- and just light on the pc and look for your prefered porn site. That will block the stupidity, but then you decide what to do. So remember that they help discipline and if you fail it's still your fault