damn, i should prob go on antidepressants just for this.
anyway, there was a time when i didn't chew on my fingers like a wild animal and i also was digging in the ground all day with my hands for root vegetables, so under my nails were a nice length but always getting jacked up with dark dirt crammed up underneath so i looked heinous. the trick i learned was, when you're in the shower, act like you're scrubbing your scalp through your hair with your fingertips and maybe a little drop of soap or shampoo or whatever if you hair allows. that does like >95% of the work in a few seconds. i'm shaved bald up top, so i use my beard for it when my fingernails get cruddy. anyway, after that i had one of those nail brushes (linked elsewhere) to finish them off, which i did in the shower with some more soap. all in all, doing it once a day in the shower, it took like 5-10 seconds to keep both sets nice.
the skull is nature's brillo pad.