The ejector and its removal...

Hello....I may need to remove the ejector on my Luger and I have read that if not done carefully it can be ruined. I know that I have to somehow pry out the rear of it and lift it out using a fine flathead screwdriver. But am I prying it out from the outside or inside of the barrel extension? Please, I need it spelled out in plain english. I would appreciate it. Thanks!