I basically decrease the way they do on that site.
I find an even number that my stitches are divisible by, and then start with that.
So lets say my hat has 40 stitches, I have a choice of how I want to decrease, depending on how much more length I want to add.
I could start the decreases with k8, k2tog if I want to use 10 as the factor; I could start with k6, k2tog if I want to use 8 as a factor. Or even 18/2 if I want to start with a very gradual decrease.
Do you see what I mean, or am I being more confusing.