Hi guys, 

My site has now been updated to the latest version of salient and I'm keen to change the navigation over to a mega menu so I can add some nice, secondary navigation. I'm looking for some advice on how best to do with based on my limited css skill set. 

Where is the most up to date documentation and/or video on how to set this up? Where and how is the best way to style it to match what I've currently got going on with the site? 
Last, how do I save a version of the current navigation and roll it back in case I make a mess of it? 
Sorry to pester with simplistic questions, but this is all a bit frightening to tuck into. 

Thanks huge in advance, 

Kim