Good advice in this thread, except for that thing with wheels. My
technique is pretty much as described. Someone mentioned that there
isn't a true corner between the ceiling and wall -- it's actually
Where I differ from the advice given is that I prefer bringing the wall
paint to the top of that curve because it's less noticeable than having
white ceiling paint on the wall. It's a line of sight thing -- during
normal activities in a house, walls [and their edges] are more
noticeable. Edges of ceilings aren't noticeable unless you're pretty
much up against the wall.
Of course, it depends on the wall color. If there's a big contrast
between wall color and ceiling color, ceiling paint down onto the wall
will be more noticeable than vice versa. If the colors are really
close, it doesn't matter much how straight the line is.
One thing not yet mentioned -- if you get the wall paint too far onto
the ceiling, you can touch up the ceiling. Ceiling paint is typically
some sort of flat white, easily touched up without sticking out like a
sore thumb. And in this case I would stay away from the wall -- just
touch up the worst spots. Something good to have handy are a few artist
brushes, for the occasional spot.
A couple other things...
Someone mentioned using a 3" or bigger brush. No -- a 2 1/2" angle sash
brush is the best all-around thing to use for interiors.
You going to have to experiment a bit with how to load the brush.
Obviously you want to scrape off the excess paint, but how hard to
scrape [i.e. how much paint to leave in the brush] is something to be
determined -- as you get used to cutting in you may want to carry more
paint per brushload.
Someone mentioned practicing in a closet -- great idea.