I set my cutting gauge and cut both pieces exactly the same size.  Also try to get them both next to each other out of the same hide if I can.   Do the ends of the liner and the belt blank. Apply cement and let dry. I then fold over my buckle end so I know exactly where I want my liner to start, . . . and with the liner doubled over backwards above and over my left hand, . . . I slowly feed the liner down onto the belt and use my thumb and forefinger of the left hand to line them