You know how recipes first list all the ingredients and then say 'Mix these two, and then add such and such' and the like? if you have sugar and butter, for example, you always mix them together first (or maybe with eggs if that's also an ingredient).
Well, I usually don't get around to reading past the ingredients list until too late. And I don't worry about doing things in an order that makes sense to me, either. I'll think to myself 'I'm probably supposed to do these two together first' or 'don't put the baking soda in too soon!' but then I'll just go ahead and toss the ingredients all in and then mix.
I've watched a lot of Good Eats, so I know better. I'll modify recipes to my liking. (For the cookies I just made, I was going to add salt because you should always put salt in most anything you bake--sadly, I forgot. I do that a lot.)
But I usually don't really think about things much when cooking. It'll work out, I always assume.
Luckily, given enough sugar, cookies still taste okay.