I lay it all out on the floor get a peice of paper and draw it all out according to what you have and what you are gonna do.......IE if you have 1/2 valves put down 1/2 pipe to 1/2 airline......trust me that work so much easier when you gotto the parts store.Go through your whole setup that way and make shure your get extra farrels and sleeves cause you might mess them up easily