Subcision risks along temples (temporal, buccal region) - Eastern Asian skin

As I have read from various research, it's stated to avoid temporal regions because of the superficiality of facial nerves: - what type of risks of nerve damage exist along these regions? I understand subcision goes into the deep dermis, where some of these nerves may reside. - how likely is it that a trained surgeon will hit or worse, sever these nerves? - do these nerves ever extend into the same plane that scarring would be at? - how does one know whether he is approaching a nerve? thanks!