Yes, you're spot on, which is why I was reluctant. I did install one just now, but then I found myself "testing it". Bizarrely, just typing in the address of my favourite P site got me excited! So, I tried another site, and another. I know that if I kept "testing" I'd eventually get so excited that I'd find a way around the blocker. So, I have to put the blocker out of my head, discipline myself first and foremost. The blocker has to be just a safety net, and it's probably the least important tool I have in quitting.