Hello. I have been having trouble for a long time with trying to understand sighting. I've watched numerous videos and tried to apply them but I just can't grasp what they're talking about(yes I've even watched Proko's video). I know how you're supposed to hold your hand and keep your elbow locked and stuff my only form of confusion stems from applying what you observe and putting it on the page. many(of the videos I've watched) have said that you can fit the exact measurement you get on the page but it appears too small, so obviously you make it bigger, but that's what confuses me. If you make it bigger(let's say you just start off marking points to your page that represents the top and bottom of the object you are drawing) how can you determine that the points you measure are accurate?