Warm up. Ever walk the halls of a college campus or music conservatory where students are in individual rooms singing or playing instruments? What strikes many experiencing this for the first time is that rather than songs, a lot of what is heard are scales and other musical drills.
Just as a chef prepares with mise en place (everything in place), and just as an athlete limbers up, begin every exercise session with warm-ups such as scales, moving up, down and across the fretboard, repeating chord changes and so forth. It’s tempting to skip this. Don’t. Warm-ups gently bring your mind and hands back into the world of the guitar, and they provide a good time to check mechanics such as good posture, proper hand positioning, and striving to hit notes so that each one rings true. Mindful warm-ups are vital to making playing the guitar second nature. It’s helpful to write down routines.