Changing Major at UCLA??????

I was accepted into Aerospace engineering at UCLA for fall 2008, and now I am having second thoughts about going in to engineering. Is it easy to change majors out of the school of engineering? How would I go about doing that?Changing Major at UCLA??????
The thing about declaring a major is that usually what you want to do when you are a senior in high school and what you want to do once you've actually started taking classes, and the school knows that. Therefore its not difficult to change. I know a lot of people who changed majors within the school of engineering.