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Don't quote me on this, but I have heard that like you stated, the worm gear needs to be pressed a little to expose the keeper so it can be removed. Once the keeper is removed, the worm gear can be pressed off. This is not an easy task as the worm is really tight on the shaft and it hard to hold the shaft to press the worm gear off. I don't know of a good method to hold the shaft to press the worm off. I had a couple worms replaced by different machine shops and both shops did a cruddy job - gouging up the shafts in the process. I decided to buy a new shaft and worm gear already installed from a parts supplier. The parts were made in Argentina (cringe), but unlike part made there in the 70's and 80's, the machining and fit were excellent. The shaft/worm gear worked very well.
Rusty Nelson