I prefer the old fashioned way, an old screwdriver and my linesman's to carefully chip away the plaster. Then cut the lath with your dykes or tin snips. No dust all over and probably just as quick.
By the way, try doing one as you plan with a sawzall and you will quickly see why that won't work. I advise doing it somewhere where it won't matter cause you're gonna have a big hole.
-Hal
[This message has been edited by hbiss (edited 01-22-2006).]
