>> is it just a matter of prising it off or is there a technique, or something to look for?
There should be a section of the back which has been ground to make a place where you can put in your fingernail or a knife blade to prise it off - imagine that the back is a disc of metal, and that one edge has been filed at an angle, leaving the other edge intact. Don't use a very sharp knife or razor blade, it's not necessary, and could damage the watch or you - a pen-knife would be OK. You don't need to use force.
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