Ejector removal is at about 3:00 mark here
https://www.youtube.com/watch?v=v-yKfdKUiPw
As he's prying it out, if you look closely with his left hand/index finger he is pressing on the front of the part where it protrudes into the interior of the receiver while he pries out the rear. That's how I do it. I use a piece of hardwood on collectibles as my pry-bar to minimize the chance of a scratch. On shooters, a screwdriver works.