Edit website built on old Nette and PHP system (CMS K2)

I need to edit a website built on an old Nette and PHP system (CMS K2). I want you to create a copy of the page in a testing environment and edit the code. You probably don't need deep knowledge of this website system but I think you need Nette knowledge. If you are interested in this project please start your answer with "I have a good experience with Nette" (assuming this is true).

Fast and reliable solution is prefered.