Questions

Yes, you can.
Your site content stored in NUZ database is (to a large extent) independent from your site design and layout.
You can modify the HTML structure of any page, as long as you leave untouched the php code that drives the content - that will be anything between the brackets.
So, have a go and good luck (it might be a good idea to save a copy of your original page, so that you can restore it if you get into trouble).