No, there's no problem. The instructions aren't telling you to force anything. Rather, most modern shutter release buttons actually have two settings — a light press (or half-press) and full. The half-press usually activates focus and possibly exposure calculations.
I don't know of any cameras with an actual physical mechanism to resist a full press, so you need not worry about breaking the shutter button by pressing it all the way. Instead, if they're in a focus priority mode (as opposed to release priority), they'll just ignore that full press. Or in this case, will allow it, but nothing will happen until focus is achieved.
