After searching for a DIY thread, the only thing I found was this useless thread:
https://www.clublexus.com/forums/is-...r-spoiler.html

So I decided to make this thread. This is for the people that DON'T have the template and aren't afraid to put a drill to their car.

Download the instructions from Sewell's website, so at least you know how to drill the holes.

Start by masking up the following parts:



1st hole



2nd hole



3rd hole





Remove the tape, put touch up paint. Wait for it to dry and put some grease around there.





Put stronger tape on the edge of the spoiler to prevent it from lifting. Put the spoiler on:





Park the car inside for everything to dry, ideally 24 hours:

 

Shouldn't 3M + adhesive wont hold it down fine?

 

Probably, but why take a chance. I did it the proper way, so I don't have to redo this down the road.