Rob sometimes one makes a decission to do something and there's nothing anyone alse can say to change your mind. In fact more often than not it's not other peoples opinion that drives you it's your own. This happens to me quite often, it's some sort of compulsive disorder I'm sure.
Anyway, if you really feel you have to go and that something within you is driving you then at least get yourself well kitted out, follow the advice of Louise and make sure you have all the necessary safety equipment to see you through troubled times should they arrive.
However, let the logic side of your brain take over when you arrive at the slip, don't let the "red mist" desend and cloud your view. If it ain't lookin right don't go. At least you will feel appeased at having made the effort.
After all, we only hear about old Chris Columbo finding America, we don't fully appreciate the fact that he went back to bed several times before he actually set the mainsail and hey, he was looking for America not the Scillies.
Whatever your decission, it will be the right one for you.