A few years ago, I shaved for a few months with just one razor. It was a 6/8 round point with just the word "Schnell" on the tang. I got so familiar with it that I figured I could use it with my eyes closed, and so I did, for a week. I did find that it actually was helpful to make use of sensory cues other than vision. The more I focused on the feel of what the blade was doing the less patches I was leaving behind.