not particularly. one simply unthreads the stem expander bolt somewhat and gives it a kosh; then the bolt and expander are out of the picture as far as freeing the stem.

there are likely a good many threads at the mechanicing forum about this process; just try searching "stuck stem", "frozen stem" or "seized stem."

you could invert the frame and pour your liquid penetrant in there and leave it overnight. some swear by liquid wrench, some by automatic transmissiion fluid and others by mug brand root beer. then clamp the fork crown in a beefy bench vise with blocks of wood. you will then have both hands free to use the handlebar to turn the stem in the steerer. presto, "bob's your uncle."