Add the water to your cooler and let it sit for a few minutes to preheat. Add the grain, stir to break up any clumps, and check the temp. It should be right around your target temp. Add a little cold/hot water to adjust the temp to hit your target. I personally don't check after I hit my temp. Any opening of the lid will drop the temp.Then add the water to the cooler and stir in grain. Once I hit my temp leave it for the mash time or check it periodically?