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I use one of these. Dead easy.
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Same here, except I use a loupe also so I can see clearly what I am doing.
As Radar says, its really easy but its also easy to scratch the case. I've got one watch in my collection in particular that has really bad strap changing scratches. The previous owner might as well have taken a hacksaw to the back of the lugs. Super pissed that I didn't notice. Lesson learned.
Thanks. Maybe best that the jeweller does it.