Cqb Tactics Question

I’ve always been fascinated and wondered the tactics and strategy behind night vision cqb combat. If anyone here has any experience doing so, when going through the structure are your movements really fast? When going into a room and seeing an enemy are they usually expecting you or are they surprised? If they are ready for you what is the course of action to combat against it? I have many questions and would love if someone with any experience behind this answered some of them.