When I did mine it was a balancing act.
I turned the cog enough to hold the disc on, but spins freely when the handbrake is off. When the handbrake is on it's very tight to stop the car moving. I found it easier to fit the wheels and move tha car and put the handbrake on to see if it held the car, I could feel one side was holding but the other was slack, so tightened it a bit more and then it held, but it didn't spin as freely as I would have liked, but it should wear the shoes down a little over time and slacken off, you could hear it rubbing a little when I rotated the disc.
Have the shoes worn too much they won't hold enough.