its very easy. I use Fertility Friend (the link to my chart is in my signature) its free to sign up. You buy a basal body thermometer and every morning you wake up at the same time and before moving, talking or anything you take your temp really quick and then record it in the chart. You can take your temp orally or vaginally. I started orally and then my temps were all over the place so decided to do it vaginally. Its more accurate that way and if you don't wake up at the exact same time its not as big of a deal. It seems like a lot at first, but once you get the hang of it its not bad at all. It actually stresses me out more if I don't chart! lol
charting will also show usually a low temp dip and then your temps will increase by around .4 degrees and stay higher throughout your LP and Fertility Friend will give you crosshairs based on cervical mucus, opk, and temps to determine your ovulation day.
even if you try it a few times and don't like it fertility friend still lets you put in days that you bd, positive opks, symptoms, meds and keeps track of your cycle length and predicts next ovulation/period.. its an awesome site!
