Cleanup and reduce the css/html in WordPress site

My website has been converted from Joomla to WordPress and works 100% like it should on the surface and in all browsers. However, there is a lot of leftover code and tags - every time I want to change something in CSS, I can't find it because there is many links to different css for everything, mainly because it links to the old CSS site designed in Joomla. The site you should clean up (all pages): [login to view URL] I really need an HTML and CSS expert to clean up my template/site so that it is easier to read both for seach engines and for those who knows html. It is cluttered and there is a lot of nested divs that I don't like. This is not for a beginner. I don't want you to just gather all the css into one css file using copy and paste - all the css-classes must be looked after one by one. 1. Gather all CSS into fewer files (maybe just one?). 2. Give reasonable CSS-class names. 3. Remove ALL CSS class tags not used (in the css files). 4. Remove most of the nested divs, as this is not reccomended. 5. Gather all javavscript into one file. 6. Update the site with the corrected html and css once you are done. 7. Make sure your customize would survive a WordPress automatic update (if you must customize a php file in the system, you must let me know about it so that I can re-insert the code into the system). 8. Some CSS is used to deactivate checkboxes due to how Joomla works. I also want you to find and remove those so that checkboxes etc. works as it should in WordPress (see the /dedikert-server) The goal is that an SEO and HTML expert can do a view source and see that everything is 100% like it should (it is terrible now): Easy code to read, clean html/css/javascript. The HTML and css should validate throug a third party validator both for HTML and CSS when you are completed. For a good example of what I want in terms of readability is another site of mine, http://bilgps.no. Almost no divs.