With the Move tool selected, in the Options bar, check Show Transform Controls to automatically display transformation handles around the selected layer’s contents. This is also an excellent way to find the center of the contents on a layer.
I think is worth to mention that guides can be dragged to central transformation handles and will snap automatically if Snap, Snap to > Guides is active.
I think is worth to mention that guides can be dragged to central transformation handles and will snap automatically if Snap, Snap to > Guides is active.