I started out like I'm sure most of us did playing 8 ball, as I got better I moved to straight pool on 8 ft tables and that taught me a lot about ball placement, also endless nights of playing 9 ball "pill partners" at the pool hall till the sun came up. For me the more I played the more natural it became to play off the rails. I never found myself using the diamonds so much for aiming, but if I picked up a partner that didn't play well, I could ususally point out where to hit. How many years have you been playing?