Need Advice; Odd Combination of Issues

I experienced ED while trying to have sex for the first time. My immediate thought was performance anxiety- but a quick self-diagnosis shows that ain't it. There was no anxiety. There was just nothing, good or bad, even though I was absolutely attracted to her and love her. I got an erection during foreplay for like a minute, but it was weak, and I lost it by the time clothes came off. She gave me oral and it only barely stimulated me. While researching effects of PIED, I've had 2 realizations about myself. The first is pretty standard: Although I may not be a porn "addict", porn has absolutely negatively altered my perspective on sexual intimacy, and I definately have PIED to at least some degree. Since discovering what it can do, the shame and disgust at my impotence have made it easy for me to decide to quit and I have no interest in going back right now. I'm ready to reboot. The second thing was much more horrifying to me: I am (apparently) what is known as a prone masturbator. I'm 22 and I've just been doing it my whole life. It feels better than my hand, so I never thought twice about it, but now I'm learning it's truly awful, and may apparently be more of a factor in my ED than my porn use was. So my big question is: Which is the better course of action- following the HealthyStrokes website guide to masturbating properly (without porn obviously) which states I should regularily train myself to fap the "traditional" way, or instantly undertaking NoFap Hard Mode until I see the light at the end of the tunnel? I'm only on day 4 so I've got time to make a decision. My main concern is that I'll recover from PIED and get my libido back, but still be unable to perform because of physical desensitization and damage due to prone masturbation. I understand this is a rather niche issue but it's become a huge point of worry me.

I would vote for hard mode. Stay away from prone if you do fall back and relapse but hard mode is the way to go. 

I read the section of YBOP regarding prone mode. I had never heard of it before and it seemed really strange that a prone position would cause that much of a problem. I masturbated in a prone position (not all the time) but it did't seem to cause any problems. Like I said, I didn't do it all the time and after I read the article, I decided that it wasn't worth testing.

Love to hear more from others.