I just installed FAE on my 2015 A20 about 3 weeks ago.  I would imagine it would be a similar project.  If you are in any way handy, you can do it.  It’s not hard at all.  Follow the directions and take the measurements it tells you to.
A couple things I would recommend-
1- remove the swim platform.  It’s really easy to do you’ll need someone to help you.  It’s heavy for one person
2- don’t forget any of the washers!  When you tighten the bolt or nut will easily dig into the metal of the bracket
3- don’t tighten the nylon washers down until you are 100%
4- be careful installing the adapter piece that replaces the flapper.  Don’t strip the screws w a drill. 
Good luck!  I’d guess you can do it w 3-4 beers and 2-3 hrs.
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