Removing tension on tensioner pulley

[Throatpunch]

Before i break something because i dont know my strength. I am to turn a 14mm socket on a breaker bar clock wise for the tensioner but which position do i start?

Do i start at 12 oclock position and rotate toward 1-2 or do i start at 9 oclock position toward 10-11?

Does this even make sense?

Thanks

[Throatpunch]

If this helps explain my fear ..My last car i tried to loosen the tensioner and broke it in half