Hi,I've been a qualified decorater for a few years having been to college.im working for myself and although the course I did covered nearly everything,the only thing it didn't cover to much was basic roller techniques when rolling a ceiling.i would just like to know if the way I'm doing it is how other decorators do it.i cut in the whole ceiling ,then roll away from the natural light working across the ceiling width to width blending it in as I go,laying it off into each bit I've finished,the only reason I'm asking is I'm a bit concerned when painting new plaster not to leave any flashing,any advice would be great .