If you're still concerned about short cuts you've made in the past, what that tells me is that you "care". Which is the core of nursing and the backbone of a great nurse. If you knowingly made short cuts and weren't bothered by them later on, that would be worrisome because then that would show that you don't care, therefore you wouldn't re-think your actions, and would most likely continue taking short cuts. I know everyone tells nurses to leave their work at work and don't bring it home with you, but I've always thought that a good nurse, the one who "cares" will always bring home something to ponder on.
So, no worries, you are just being a true nurse. We all make mistakes. In fact, it's sad to say but most nurses will tell you that they'll never do this or that ever again because a mistake the made years ago. Like I said, if you care, you've acknowledged that you made these short cuts, you're a good nurse and probably will never take those short routes again. Keep caring my friend because that's why we became nurses in the first place. :-) ;-)