DxO Support Page for Nik Collection 

Theme Infrared (or my view enhanced B&W)

The Forgotten Adjustment in Nik Silver Efex Pro

Infrared Film Filter in Nik Color Efex 4

Morgantii Nik Color Efex 4
.. and Control Points

Control Points

Mastering the Nik Collection - Anthony Morganti

Using Efex Pro2 HDR

Dfine 2 User Guide
.. apply noise reduction as early as you can in editing workflow
.. turn off noise reduction in camera or RAW conversion (let Dfine do it)
.. apply noise reduction only when necessary

Color Efex Pro User Guide

Reduce Noise Tutorial with Dfine 2.9 ..

Anthony Morganti - my go-to web instructor for Lightroom, Luminar and Nik

Mastering the Nik Collection - Anthony Morganti

Actual links (hyperlinked in titles above)