Yeah, I'm like that, too. I usually don't keep up any kind of documentation for anything and any attempts usually end in me quitting after a try or two. But I'm finding that if I don't write down what I did, my memory fails me. Did I do all 8 reps last time or did I fail at 6? What weight did I try last time? I forget. Maybe after a while the progress won't be so fast and it'll be way easier to remember.
Female, 5'3", 49, Starting weight: 163lbs. Current weight: 135 (more or less).
Starting squat: 45lbs. Current squat: 160 x 2