When I first started, all I was doing was taking my temp and writing it down. I wasn't tracking CM or anything, and I wasn't even "charting" my temps. I never saw the pattern until I got my FF account and then went in and put in all the temps from all those months ago. That's when I saw that I had some anovulatory cycles and some really short LP's.
That's when I started tracking my CM and everything... since then it's been pretty clear, although my thermal shifts were not as big then as they have been the past 2 months. Not sure what that's about, if anything... but there you are.