Any tips on how to achieve a reasonably straight line at the corner of
ceilings and walls. Going to paint the ceiling, then a couple days later
will paint the walls - always seem to get a bit of wall paint on ceiling
and/or vic versa. Cheers.
Get somebody else to do it! LOL
But seriously: A good quality, well broken in brush (to a knife edge)
correctly filled with paint and a good, steady hand with lots of
confidence - along with working from a comfortable and stable steps, trestle
or low scaffold to get to the correct working height for your stature.
As a matter of interest, if you are using emulsion paints for the job, have
a bucket of warm water and a good rag to hand and simply wipe the overpaint
off the ceiling with the damp (not soaking) rag.
Or do as I do, paint the ceiling and bring the emulsion down the wall by
about 25mm and then paper the walls - saves a lot of cutting in (and I hate
painted walls). :-)
Well, just get an extending roller, and do it standing on terra firma. And
paint the ceiling the same colour as the walls, that avoids your original
problem. Or if you don't want to do that, get SWMBO standing watching 
and she can tell you when you've got a bit of paint on the ceiling, you can
wipe it straight off before it dries.
 She probably will be anyway.
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