For the most part putting on a sight is simple. It can be put on before or after the rest is installed but i usually put it on after just because that is the order that I do it. The rest you have purchased bolts on with two allen screws. Go get your bow have them put the rest of your choice on and set it up for center shot and set your nock point. Then when your sight comes bolt it on and loosen the windage bolt so you can move the sight left and right. Holding the bow in the vertical position, line the string up with the center of where the arrow sits on your rest. I like to do this with an arrow nock so i can see exactly where the string cuts the arrow in half. When you have your string positioned behind the arrow move your sight left or right so that the dots of the pins are covered by the string. This will get you close but some fine adjustments will need to be made when you sight in.