Your righthand is considered the engine (presuming that you're playing the guitar the old-fashioned-right-handed-way).
When you're in a car you don't look at the engine all the time to see if it's running, so don't look at your righthand.
You don't look at your lefthand either.
The only thing you must look at is, in case of a change of position on the fretboard, the position you're about to move to. Let's say you're moving from I to XII, you look at XII before you make the move, so you can stop your hand in time when it's arrived in the right position.
So: Never look at your hands when changing positions but always at the position you're about to move to.
That way you'll always make a sure move.
Greetz
Dropje9999