This is less of a pretty post, but N is for Nails, because they are something important to me, even if a bit embarrassing. I have bitten them since I am very small, and even when I'm not biting them, I keep obsessing about them, looking at them and prodding them. Most of the time I don't even realise I'm doing it.
I've tried to stop many times, but only sheer will power does anything (nothing else helps, not the nasty-tasting nail polish, nor getting spanked as a child by my parents; only me helps, only I can do it). Often my mood or tiredness don't leave me a lot of room for will (I have certainly noticed that I bite them more when I'm anxious!), so I never manage to be more than a small number of months "clean".
As well as sheer will, keeping them short and always having a nailclipper handy helps. The moment *something* happens to one of them, my brain turns them into fair game!
I manage at times. Often I will manage to get them nice enough for a creamy light nail polish, which also helps on stopping me from biting them. And sometimes, some glorious times, I get them good enough for bright red nail polish.!