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Most blades use a strong wood glue so if you boil the blade handle in water or take a cup of boiled water and let the blade sit in there for 1 minute you can get a razor blade and/or flat head screwdriver to wedge the handle off.
DO NOT microwave a carbon blade as your blade will basically either burn or explode. Wood blades can work fine in a microwave for 20 seconds or less, but realize that you always run the risk of damaging / warping the blade from the appliance.
I've swapped a few handles recently and had great success with the boiled water method.