Do you have rules in the way you stitch? (i.e., Do you start in the middle? Do you determine which blocks to stitch first? Do you always start from the top or the bottom? Do you have special paths to prevent wasting thread?) No rules. I tend to start in the middle because I'm not very good calculating where else to start. Other than that, I go where my heart takes me.
I once met a woman, an engineer, who plotted out her path for all of her stitching before she even picked up a needle. That strikes me as a colossal bore and a waste of time. She may be conserving floss, but that doesn't mean I'm profligate. After all, how much money is she saving by coming out four inches of floss ahead of me?