First off I am in no way, shape, or form an expert, I am maybe a step above a beginner if not still a beginner. The answer is NO it is not that easy, especially when you are starting out, just like turkey hunting it takes time to learn.
Those guys that make it look easy have been doing it a while in most cases, I have seen some people pick it up and go like gangbusters. (I hate those people)
I have taken people out of pictures, which is not real hard depending on the surroundings and colors they are wearing and background colors. AI does make some things easier, though I have not played with it much.
Here is an edit I did, I have a LOT of time into it, and I am still not happy with it.
Original Picture
Edited Picture
If you look to the front of the train you can still see the outline of the woman and the same of the people in the back.
By the way, no, it is not worth it for just a few pictures. I have edited some stuff for others here, I am willing to try if you would like me to but it may take me a week or so, my girlfriend just got out of rehab after breaking her second hip in four months and I am caring for her, if you are willing to wait I am happy to help.