click on image for larger render. V4 with IBL lighting, BlackEyes in place, ActualEye texture with optional reflection on reflect node.

a couple of things. Easy to locate...because i've done it so many times. You make the Leye and Reye of V4 or whatever not visible. The BlackEyes are full objects, you just click them into the scene, then move one of the axes until you see it, then grab it and move it near the eye socket or use x/y/z until settled in place. Note: you might have to increase or decrease the overall scale, or even 'flatten' the eye by scalling z, to make it 'sit' against the opening properly. Yes, you have to fiddle with fine adjstments of z/y/z to get it just right.

The dials.... you have to move the eyes separately. There's an up/down and left/right, of course. Also, iris size, pupil dialate and 'slit pupil' (for wierd effects). 

I find it easy to select the eye by clicking right one it, seems to always find the orb and switch focus to it. Watch out for AO, it can sink into the 'not quite perfect' touching of the eye model to the character and you get AO buildup.

NOTE: addon product is "Actual Eyes" which I have, also. Beautiful texures for this mesh. There is a cool lacrimal shader that comes with actual eyes. Also, reflections textures that get attched in nodes, sure does put reflection in the eyes (See above), but you might not want that for animation.

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