I used a hammer to remove mine. It is fun anytime you get to hit something with a hammer. The transducer popped right out and the glue stayed. Then I took the new transducer and glued it in the exact same spot.
if you didn't prep the hull really good when you put it in, you might be able to lift an edge and peel it back. get a screwdriver under it and twist the screwdriver to lift it up.