Don't fear failure so much that you refuse to try new things. The saddest summary of a life contains three descriptions: could have, might have, should have.
Recently I met with a client who recruited a new team member with a view to this person being a potential successor. What appeared to be a great "marriage" has thus far proved to be a disappointment for all concerned. There are many reasons for this but it highlights why a successful marriage (whether to a prince or to an organisation) requires a bit more forethought and attention than the fairytales would suggest.