I use to shoot a white tail 2 for years with no sights. Got pretty good. I would set it on 45 pounds and start out at 10 yds. Move back slowly. Have a BIG target.
U could use a glove instead of a release. Just like a long bow.
I shot a tab and no sights till 2006 when I had to buy a new bow, newer bows are to short to shoot fingers so I moved to a release and sights too. I killed the most of my deer this way but only shot to 25-30 yards.