Joe,

Sorry, but it's a daft question and poll.

Sailing skills appropriate to the passage being attempted are VITAL before leaving harbour - i.e. 100%. That doesn't mean that you have to gain those skills in a school, passed an exam or hold a certificate (most ICCs originally came on the nod from the sec of a yacht club).

There is no absolute need to have plumbing skills, or carpentry skills as long as you can cope in an emergency as you can pay a professional. There is no need to have DIY paramedic skills, dentistry skills, cooking skills, either, but maybe they help at times?