As said, I just lower the motor, and may turn it over for a second, but no longer than that. Also plug the live well intake and drains. Make darn sure the batteries are full when I start off. Also keep a set of heavy sweats along with the rain gear and such in case something happens and someone gets wet… there is a quick change available to dry and warm clothing.
My first time fishing out of pool 4 in the cold temps I dropped the boat in, started, and then freaked out when it wouldn’t pee any water. After several minutes still nothing, and I was five hours from home… getting ready to explode thinking the trip was lost. Never dawned on me the Yamaha had a thermostat. As soon as it warmed up enough, it started to flow. I almost pulled the boat out of the water to give up, but a local that fished in those conditions told me to be patient… and about the thermostat. Sure enough, whenever I am out and it is very cold, same thing happens. Now I have told others at the landings the same thing as they go through the same experience.