>>11603998dont know how to do stable diffusion, but roop is easy
https://github.com/C0untFloyd/roop-unleashedDownload the windows zip file, and run the .bat to install. This will also run the program, which will open in a browser.
Just select the face you want to use (straight on, nothing obscuring face), and then the video to put that face onto and hit Start.
There are settings you can mess around with, but I just leave it default and get good results