Get all your news, not from FOX but from all the sources available to a president, many of them not available to the rest of us. Announce your decisions after due consideration and consultation, not impulsively on Twitter. Cultivate common good manners when dealing with people. Do no be misled by the crowds thatcheer your boorish rudeness: they are a minority of the American people.
Listen to experts better qualified than you are. Especially scientists. Be guided by evidence and reason, not gut feeling. By far the best way to assess evidence is the scientific method. Indeed, it is the only way if we interpret "scientific" broadly. In particular--since the matter is so urgent and it may already be too late--listen to scientists when they tell you about the looming catastophe of climate change."
--Richard Dawkins, when asked by John Horgan in interview, "What would you say to Trump if you had his ear"?