Just slice it off at the base as close to the rock as possible. Put it in a glass or plastic container with some rock rubble so it doesn't get blown all over your tank. The mushroom will regrow its base, attach itself to another rock and remain its original size.
The part of the base that was left attached to the rock will repair itself and continue to grow. It will be mishapen for a while but will eventually look like another healthy mushroom. If you pile rocks on top of that bit of base that was left on the rock I don't know if it will reform or not. Judging by how indestructable many say mushrooms are I would be inclined to say yes.
Don't be afraid to start cutting away, it really is amazing how well these things survive when transplanted.
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