>Well, my script isn't that difficult yet!
It doesn't have to be difficult. You might look at it later and wonder what you were thinking, why you picked that particular solution. Good comments rarely describe the mechanism and more often hint to the reasoning behind the design. It's much more useful to have a look into the programmer's brain than a play by play of what each line of code does. The latter can be figured out fairly easily, but the former is lost when the original programmer can't be found or has forgotten.