KNOWLEDGE...It's the one word that I could think of that encompasses everything...The more you continue to learn, the more you can tweak your technique,providing improvements to the process which leads to an increase in the quality of the final product; which is the ultimate objective.
I think it's just as important to know what DOESN'T work, as it is to know what does work.
I also find that it helps to know that there are times that you should put off cutting until a better time (don't cut when you're already frustrated about something else; don't cut when you're rushed for time; don't cut when you already know that your on-hand supplies won't support the desired results)...Also, I find that I won't cut after cocktails; not only for the obvious potential hazards, but when (I said when, not if) the cuts don't come out right, it gives just one more excuse why it happened.