I'm planning on mounting a Trijicon RedDot sight on my Ruger BH in 45 LC. I understand I will need to drift out the pin which holds the rear sight in place as well as screw out the elevation screw. I've got pin punches and the proper screw drivers. Is their anything I should know? Like, which order to remove 1st; pin or screw? Left to right or right to left on the pin?