as they are saying it's that easy.
I did it last weekend on mine.
maybe take a quick look at this one for a hint only to get started. or just lookup any vids. Ninja 636 - K&N Air Filter Install - YouTube
but i didn't need to fully remove the tank, just raise it as far as it goes then tie it up there with a bit of rope.
good plan btw, I unexpectedly found that the K&N made a huge improvement over the standard issue by way of it's running way smoother now.