You got it. You're really on the right track man.
I had sex early on in my reboot as well--it might cause a chaser effect and/or make you feel crappy for a few days after, but I don't think it set me back or anything. Out of the three things you can do, I'd say sex is the safest. I could be wrong though, so take it with a grain of salt.
I used to think that after an "x" amount of days I'd be okay too. Time has slowly beaten that thought process out of me, but some people won't take as long as me to get better, so it works for them.
Yeah boredom is tough, but a lot of my boredom stems from the anhedonia nofap creates within me. Real life isn't as shiny when my brain is used to pmo as its go-to pleasurable activity. Don't know if that's the case for you, but I would at least examine how you used to be and compare it to how you are now. Has life gotten more boring recently, or have you always struggled with it?
for me, on the days my brain is in relative sync with the outside world, I have to choose between fun activities as opposed to forcing myself to conjure one. Instead of grasping for fun, I have to decide which activity is the MOST fun. Withdrawal makes life kinda boring. I don't have much of a desire to be social, or watch movies, or read, or any of that shit. But I've also destroyed my brain so badly that I don't really have a proper frame of reference anymore. I forget what it's like to want to do shit. Not until I was 27-28 did life really start to get bland and painful, and now I can't really empathize with guys who aren't as completely wrecked as I am.
Good luck. I would keep your hand away from your peepee as a rule, but if it didn't set you back this time then I wouldn't reset your counter. Counting days can be nice in the beginning when it comes to motivation, though what I said earlier should be the mode of thought as you get out of the beginning stages.
After the first 30-60 days it becomes much easier to not relapse, so just fight through this beginning section. But people get complacent and cocky and they fuck up because they forget how strong of a hold porn used to have on them. Don't be that person. You can't return to how you were before. I've seen several cases of guys coming on this forum who are filled with energy and motivation to quit, and they succeed and start to feel better. And then they either disappear without stating they relapsed or they do write that they relapsed, and THEN disappear. I used to do it myself.