Skim coating textured walls

This house like many others have had a texture finish applied to the walls and ceiling.

New item by Pete Olson / Google Photos

That is all well and good until you need to either make a repair or lets say close up a opening. It is really difficult to match  especially in the middle of a wall. So in my case the solution is to skim coat over the texture making it a smooth surface.
Below is a short video on covering up the texture on a wall.