Blender 2.8 makes denoising your renders dead simple
But there are a few do's and don'ts you need to know. (Plus testing denoising photos, Eevee renders, and animations!) If you're not sure about the best way to denoise in Blender 2.8 with Intel's Open Image Denoise compositing node, this tutorial is for you.
Since Blender 2.81 isn't out yet by the time of making this video, I'm using the Alpha version which you can download at blender.org/experimental.