Well if this will be your 3rd year bow hunting you are 1 up on me. Last year was my first. I really thought this would be much more difficult. I'm really rather surprised at how easy this was to get used to.
There is only one VISIBLE reference, however I still have 3 physical reference points in my anchor points. As long as I put my knuckle, my kisser button, and my string in the same place for each shot I'm on.