For me its when I interact with the real world. I see people with girls; and I tell myself, "I should be having her, if I only rebooted fully last time." Another hard part for me is when I have to confirm with myself that I didn't relapse. With me if I even accidentally look at a commercial on TV with a hot girl or a ad in the mall I get all paranoid that I relapsed. Because of this I gatta tell myself "I didn't relapse, did you go on a porn site? No, Did you masturbate? No, Then you didn't relapse." I repeat this at least 50 times a day. What is the hardest part of rebooting for you?