I have no problem telling someone the basics of removing their popcorn ceiling--basically spray the ceiling with water and scrape off the popcorn. But to cover all the bases--how to determine if the ceiling has asbestos and what to do if it does, what to do if the ceiling has been painted, what to do with the surface after you remove the popcorn (the issue Harley mentioned--though in my experience it didn't take hours to deal with)--that takes a lot more time and space.
Yes, I do have a book that will explain all that. And yes, it's also true that anyone can get the basic information for free in this forum or several other forums. I just want people to know the information is available if they want to go that route.