How to get a granite counter top with sink off a wooden bathroom vanity
Use a long sharp knife, like a carpet/flooring knife, to slice through the caulking or construction adhesive that was used on the top of the vanity when the sink was set onto it. Then yes, use a lifting/prying strategy that minimizes potential for damage to the cabinet. You may need to slice, lift a little, slice some more, lift a little more, slice...