Left wrist (I'm a righty), facing in, proximal (or just before, if heading down your wrist) to the bump.
I've been wearing my (large) Band this way for over a week now, and barely notice it now.
I keep mine medium loose normally. That is I can push outwards on it to create a 1/4 inch gap between HR sensor and wrist if I want. Untouched it hangs perfectly flush.
When I workout at the gym I tighten it a rouch, but never have it set so I would call it tight.
At night, I keep it on the loose side as well.
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