Confidence is good, yes. Overconfidence... well, I'm just going to try to keep a reasonable assessment of myself and my Pokemon to avoid it, if I can.

[And if she can't, Lightning will pop up out of nowhere and smack her upside the head with a lecture.]

I've heard that too. But no, I can't say I've ever been there. I still have six badges to get in Johto before moving to the other region seems reasonable, particularly if the gyms are that much harder.