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GETTING A STRAIGHT EDGE ON CORNERS
Before or during your last coat, you can run a small brush with plaster on it in the corners of the tape and the wall. You can also smear your finger (while always wearing gloves) against the tape and edge of the plaster. This insures getting a clean professional line when you unmask it.
GETTING INTO HARD TO TROWEL AREAS
If you're trying to get into nooks and crannies, use a smaller tool. Get a spackling knife or even a square of plastic from a milk jug...whatever works. Use your fingers. Sometimes you'll find special tools for this at the hardware store. Try painting the plaster on with a brush in those tighter spots.
Use care or a corner trowel for corners. Use a flexible rubber 'half-moon' trowel or your hands for bullnoses.
If you feel that you're done, you can unmask it. If you have chunks of dried plaster on the tape, you'll have a harder time and you might rip out a few fragments of plaster along the way.
A good idea is to mist the tape with water softening the plaster a little. Also, it's not a bad idea to gently score the tape line with a razor before unmasking. Careful you don't scratch the wood if doing this.