The theme comes with sample-data.xml file which you can import to create a exact replica of the demo site. Once you have it setup, as you say, you can just focus on a tweaking the site.
For setting up things, pls go through the documentation – the first section talks about installation and also has a section called ” Importing Theme Data” at the end which provides links to videos on how to go about importing the data. While I urge you to try this yourself to understand the process, if you still have trouble, pls send me a private message here with a temp login to your site and I will have it setup for you.
The theme also comes with a pdf on how to enable and import data for the revolution slider slides as well. Thanks.