It was actually two now that I look in my bookmarks: https://www.youtube.com/watch?v=w6PTviOCYQY and https://www.youtube.com/watch?v=FaLTztGGueQ . That first one is about 1 month old and was already about running Dreambooth locally. So to be perfectly honest I'm not really sure any more which info I got from which video. Probably most from the second one. It's worth it for just the thumbnail - although I haven't been able to get results at that level yet, holy smokes is it impressive.

Not OP, but this is fastest tutorial for getting dreambooth up and running in automatic1111 I’ve found:

https://youtu.be/_GmGnMO8aGs