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See xman's demonstration here:
http://straightrazorpalace.com/videos/27179-one-handed-shaving-technique.html
His 2-handed grip at that area was what scared me most when I first saw it, but it gives...

Near the mouth: I've learned to contort my face so that the blade can "overhang" my mouth without making contact with my lips. This makes positioning easier. I find a simple S-N pass is close enough...