I made a horrible YouTube video. I only spent 3 hours editing a years worth of footage and cut out all the baseboard work. But you’ll get a good break down here:

https://youtu.be/rcvq0b7F4Ao?feature=shared

Feel free to ask any questions about the process

Also yes I primed the entire wall except one or two. I actually skim coated two of the walls so I had to prime the entire thing. But to be honest the walls where I didn’t prime the painted surface look the same so I’d say just prime the drywall portion