I don't think it's altogether a big deal. I mean sure you go around making a bunch of huge mistakes over and over again people are going to look down on you but it's not going to be like "Ah there goes that knight that made that mistake that one time. Let us shun him and his family for the next seven generations"

You do things right people are going to appreciate you. You do everything wrong no one is going to want to associate with you but there aren't any really strict rules about honor. Unless of course you want to make up a country for you character to come from in which honor is a big deal.