In beauty/modeling school, many many moons ago, they said to never pluck from the top, as that is the natural outline of your face.
Just get the few lower strays to clean up the area just above your eye.
Next, take a very thin something or other, such as a skewer. You want to line up the outer most part of your nose with the innermost part of your eye - anything in between that area of your eyes needs to go - no unibrows, but you don't want to pluck too widely or it will make your eyes look wierd.
Then you measure from the outermost part of your nose to the outermost part of your eye and again, anything past that should be plucked.
That should make things all cleaned up without taking too much off.
That said, IMVHO, I really think it's worth the $10 to go get it waxed off every few weeks and just do maintenance in between.