Leather and rubber straps are flexible enough to allow a strap tool (the flat fork shaped one) in between the lug and the strap, and to let you compress the spring bar enough to lift it out. The risk of accidentally scratching your strap is real though. If you're not comfortable doing it yourself I'd have thought most Omega boutiques would do it for free on the spot (I've seen someone walk in and ask if they could do that and they happily agreed).
Leather and rubber straps are flexible enough to allow a strap tool (the flat fork shaped one) in between the lug and the strap, and to let you compress the spring bar enough to lift it out. The risk of accidentally scratching your strap is real though. If you're not comfortable doing it yourself I'd have thought most Omega boutiques would do it for free on the spot (I've seen someone walk in and ask if they could do that and they happily agreed).