We probably do a couple of these a day. It certainly isn't rocket science, but you'll need the pump to fill from the bottom and the one time use pan bolts. We use our xentrys to pull up the trans oil temp and drain it at 35 to 40 degrees C. until the flow just starts to cavitate. I've even gotten lazy a few times and just used an infrared thermometer gun on the pan, but only after knowing what the temp is on the pan in relationship to what the actual oil temp value is.