I personally temp in my mouth. I always wake up and roll over to get my thermometer that is on my night stand and take my temp while lying on my right side with the thermometer under my tongue on the right side with my right hand hold the thermometer in place and the cap to the case and my left hand holding the big part of the case. HAHA. I am sure you wanted that much detail, right?
I do know that other people here temp vaginally and get more readable charts but I am happy trying to interpret my see-saw-ing chart.