Trump is going to be just fine once he takes the narrative out of the media and writes his own by exposing Hillary's flaws in a one on one matchup in front of hundreds of millions of people.
Hilary is shady, corrupt... but most would agree she'd be a competent president. Obama II, of course, but she isn't going to drive the train off a cliff. Most of us can already predict a Clinton presidency, it'll be just like the obama presidency.
Now, a trump presidency is a BIG question mark. He's mocking saudi princes for spending daddy's money (ironic). He's shitting on GER Merkel because she beat him in a Time Mag poll. He's attacking world leaders on twitter out of boredom... and those are powerful people that don't forget, capable of screwing us in a million little ways.
More importantly - I think most of us agree Trump has an issue with self-control. He cannot stop himself at times. He reacts emotionally on social media late at night, and is very inconsistent on a lot of things.
Trump will be WAY better in debates and interviews than Hilary... but as far as fcking controlling himself... Can he do it? Will he magically go from being a smart-ass, loud-mouth for 69 years, into a dignified Reagan overnight? Doubt it...
(This doesn't even get into his very thin understanding of foreign policy and erratic speech this week)