Trap is an interesting sport. It comprises of 5 shooters standing 16 to 24 yards away from a bunkered throwing machine on a cement pad. Each take urns ctalling for, and shooting at, clay pidgions thrown from the machine. The machine throws the clays at a random angle somewhere between 11 degrees from center.
When letting up for the shot your cheek should meet nicely with the stock and your eye should be at the same height as the top of the rib. Your sight picture should look something like this.
My strongest pice of advice for somone who would like to participate in this sport is to keep practicing. Your scores will start low but the more you keep at it the more intuition and skill you will gain.