DSMC2 – OLPF swapping is safe and reasonably trivial. Only one tool is needed, all screws are captive, and nothing that is exposed in the process is more sensitive than might be exposed during a lens swap. As a rule of thumb, if it is safe to swap lenses, its safe to swap OLPFs.
DSMC1 – OLPF swapping is simple but requires care and precision. Small loose screws mean that this is best carried out with the camera tilted back at 45 degrees, on a work bench, or at worst on a camera cart in a clean environment.