It is so simple that even an idiot can understand it.
Let me explain it to you, I once adjusted the sites on my OlyArms AR-15....well, let's just say that it took me a while...like two hours...because I could not figure out which way to adjust the rear site...Even if it did take about 700 rounds on a broiling summer day with the hand guard too hot to hold and sweat dripping down into my eyes so I couldn't see. But none of that was my fault. Nope. OK, I finally did it, which proves that even an idiot can understand it...eventually....