How is Istikhara by Tasbih performed? Which hand should the Sibha be taken in and how should one hold the Sibha? How should we choose a random spot on the beads? In what direction should we be counting two by two?
Don't overthink it - just do it - the whole idea behind it is that Allah is guiding you and you are not controlling the action yourself. Allah is merciful and will not deprive anyone of divine guidance due to details.
Usually people have in mind which direction they will be counting and then do it, for instance if I am holding it with the main bead to the left, I have the intention I am counting that way before I proceed.
Maybe someone here can post a video on YouTube or link to one (hint).