Ability to add Custom CSS/Javascript Per Page/Post in Wordpress

I already have a working website. Now I need to complete styling and content changes. I don't like the Wordpress editor. I need ability to add custom javascript/css on a per page/post basis. I have seen other wordpress installations with this functionality, but not sure how it got there. Give me the ability to add custom code to each page/post and I will be a happy camper.