Hi, I'm looking for advice from someone who's done this before.......

I want to swap a rubber strap on an Ikepod hemipode to a titanium band. First, of course, I need to remove the rubber strap, which is secured by a screw on either side of the strap by the watch case. On turning a screw the opposite one also rotates and I make no progress, so I think I'll need 2 screwdrivers - one on either side, one stationary and the other rotating. However, aside from being awkward to do, there is a lot of resistance when I do this and I don't want to ruin the screws. If you've done this procedure before am I going about it in the right way? Any advice?

Thank you.