sorry but thats not great advice.Looks good man! here's a little trick to help you hit your mash temps. Heat your strike water about 10 degrees above your strike temp and then pour it into your mash tun. This will preheat the MT for you and and you will probably lose about 7 degrees or so from the kettle to the MT anyway. Stir the water until your water hits your strike temp, add your grains, and hit your mash temp. Have fun boss!
sorry but thats not great advice.
If you add your grains when your strike water is exactly what you want to mash at you will be way off.
You need strike water at least 10 degrees above mash temp. The cooler grain will suck the heat out of your strike water causing you to come in way under.