I dive a single tank with a simple recreations (BP/W) setup. I tuck the extra hose into my waistband.
When I am gearing up, first I put on the backup on the necklace, then I let the long hose run down my right side, across my chest from my right hip to my left shoulder, around the back of my neck from the left to the right, then stick the regulator in my mount after bringing it to the front past my right ear. Then I tuck in the excess hose into my waistband, pulling the loop down until the reg sits nice in my mouth with no pulling. Then it is set, and I take the reg out of my mouth and clip it off to a D-ring that is near my right shoulder, until I am ready to use it.