i just got done doing this for my mother in law. no good way to do it! heres what i did. started off with a 6" scraper, got all of the big stuff with that. then went with a hand sander(the kind that hooks to a shop vac) and 100 grit cheese cloth sanding paper. had some cracks to fix, taped and filled, start with a 6" knife, put down a bed over the fiberglass tape, as smooth as possible,you may have to sand this if its not smooth. then after that dries, use a 12" knife, after that dries, use the 12" knife, but put the edge of the knife on the center of the tape so you end up with 24". then skimmed the entire ceiling. skimmed it twice more, the last(finish) coat has to be perfect, use new mud, any contamination in it and it will show! light sanding again, and prime. the paint you use will make all the difference in the world, gloss will show every in perfection! semi, not so bad, flat and you will look like you have done this all of your life. i ended up with about 4 days in this project, like i said, no good way of doing it, just gotta man up and do it. oh ya, asbestos or not, get ya a good mask! good luck, and if ya got any questions please feel free to pm me, little d.