I certainly wish Trump luck. But give him credit? Not for what he's done so far. If he manages to act like a grown-up for a few minutes and actually have a discussion with Kim, then maybe he'll deserve some credit. But all he's done so far is fling a bunch of childish insults. Talks have started just because the world realizes there's a bigger problem than North Korea now -- the world's last remaining superpower has a mentally-ill idiot as president, and a population that's at least 35% scumbags who seem willing to support outright fascism. Being a lunatic the rest of the world feels the need to align against is not enough to earn anyone a Nobel Prize. If it were, might as well hand one out to Kim, too.
Talk of giving Trump the Nobel is ridiculous, by the way. It was also ridiculous to give Obama one, but at least he was a competent president. Trump still has not actually held the office he was elected for -- he doesn't even understand it, he just likes the attention of America's shittiest people, and he plays to them. That's all he understands about being president -- "Assholes like me! So I gotta be a garbage person so they'll keep clapping for me! I like clapping, it feels like the approval daddy never gave me!"
That's not a diplomatic accomplishment by any means. So far all the diplomatic work has been done by South Korea and North Korea. Trump has done nothing but call names because he's trying to make America's worst people clap for him. He deserves no credit for that. If he does something better down the road, when he actually meets face-to-face with Kim, then we'll revisit the idea of giving him credit, but so far he's just been an embarrassing brat. And that wasn't a tactic or a strategy, it's just the only way he knows how to behave.
I've never seen people try harder to give a complete incompetent so much credit for so little. It's like giving a dog a Milk Bone because you like the new carpet you had to get because he kept shitting on the other one.