The first thing you need to determine is if you are right or left eye dominant. The NRA Instructors will help you determine this in your class (send me a PM and I can send you a link). Don't be concerned regarding what you do not know before you get the the NRA Basic Pistol. You need to use your dominant eye for aiming. IF you are able to keep both eyes open do (greater field of view, dominant eye does not squint so less eye strain and more light). However, most people (especially new shooters) are not able to do this. You focus on the FRONT sight only. The rear sight is a little fuzzy and the target is a little fuzzy. Center the front sight (horizontally) in the rear sight and have the top of the front sight level with the top of the rear sight.