I used to plan. I actually prefer not planning. I found that when I planned, it never went right anyways. So if I'm having issues remembering, sure I'll jot down a few reminders.

Now I do, however, have a really bad habit of obsessing. I play scenarios over and over and over again in my head. It doesn't help prepare me in anyway as reality is always different than what my mind comes up with. But it's something I've done since I was little, and it's difficult to shut it off.