Take this seriously my friend (not saying you aren't). Learn from me: though you shouldn't behead yourself because of a relapse--view them as dangerous, because they are. For me, it's only gotten harder after every failure. I've kindled my addiction into a fucking magma troll. It spews distilled, liquid pain in every direction. I used to be in a position similar to yours, where abstinence was tough but the pain of the withdrawals weren't debilitating. Now they are, and they last much, much longer. The first time I made an honest go at this, I made it to 205 days and was pretty much at the finish line. Then I fucked up because I didn't take it seriously enough. Don't make that mistake. This shit can be lethal if you let it. Just look at how popular this forum is. Porn addiction is a fucking scourge, and it cannot be overlooked by anyone who get's hooked by things easily.
On a positive note, I respect your dreams and accomplishments, and wish you all the best.