Do I really need 7 pairs of jeans?

So I read this article in Time, and I've been thinking about doing something like it, and have come up with some options.
1) count all the things that are in my posession to see what I'm dealing with and then downsize.
2) get rid of any article of clothing that I haven't worn in the past two months, minus "winter wear" and then go through other belongings that haven't been used in the past 6 months and get rid of them.
3) go through my belongings and keep 100 things, trash, give away, sell the rest.
4) get rid of everything except a weeks worth of clothes, all my books, and a shoe box full of things that mean something to me.

What I'd like to do is #4, but I think realistically I'll be doing something like #2 and #3. I'll keep you updated as it goes along. Whenever I move again it will be so much easier, and my room won't be overrun by stuff. Anyone want to take the journey with me?