How do you actually set up the no peep? I don't understand the logistics of pulling your bow back to your anchor point, then lining up the no-peep, or exactly how it is done? Do you find that it is difficult to learn to use? Also, it sounds like the no-peep won't line up if there is anything changed in your set-up. Do you have to change your no-peep each time you change something with your set up?