I spent part of today wired with a clip on radio microphone. When I first wear these things I am very self-conscious. The technician says things like "don't worry - the sound is off and I'll tell you when I switch it on". For the first ten minutes I then walk around as if there are 20 microphones following me, somewhat conscious of what I am saying.
Then I forget (until I'm 'up') and anything could be happening and I'm oblivious of those listening.