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You can change your page header! Just click on the Properties tab on the Content Sidebar and edit the Page Heading; you can do this for each page of your site if you would like.
I think you could accomplish the second part of your question with these steps:
1. Click the down arrow of Save and click on Save Page As (for the page you want to edit and replace)
2. You will then be prompted to give a Name
3. Uncheck the box for "Show in Navigation", this way you could work on changing it while the other one was on the Navigation for people to see.
4. Then when you are finished, you can put the edited one on the main navigation, and delete the old page.