On a couple of my old outboards I use to put on the ear muffs.Add 2' garden hose with a large funnel.Fill up the funnel with a jug of plumbing antifreeze.Start the motor in idle,and before you know it,antifreeze out the tell tale and exhaust. Shut off before antifreeze runs out. Just a bit of extra insurance.
Usually I would run the motor with water for 5 mins or so" first" to make sure thermostat is wide open if equipped. Done.