It doesn't matter which way but are you using the MGW sight pusher or punch + hammer? If using the sight pusher, it is easier remove and install from left --> right because there is much more room on the right side of the pusher and it prevents marring of the Trijicon logo on the right side of the rear sight.Hi just got Trij HD sights for my USP9C like to know in which direction to remove the old ones with gun pointed away from me left to right or right to left thanks .