How do you approach a new script?

[DustyPorViva]

So, you've got a new script to do. How do you approach it?

1) OH I'VE GOT A GREAT IDEA... I don't have much of an idea how I'm going to do it, but who cares! *Opens up RC and starts scripting until something works* You often hit snags in your code and rescript entire methods over and over again as you come up with better ways to approach it.

or

2) OH I'VE GOT A GREAT IDEA... Let me think about it, plan it out and come up with something solid and then start scripting. You'll still occasionally have to rescript things or come up with new methods, but you were always one step ahead of everything.