I also like to point out that play huge size maps. I think the map size has direct effect in the difficulty level. The bigger the map, the more challenging is the game.
New to civ. I've played one game on each difficulty level, moving on up from Chieftan, diff civ / strat / win condition / map size / map type each time to try things out. Haven't lost one yet, or really been in much danger of losing. Immortal's up next, I think that might be a good difficulty level to stay at (doing the math, the AI gains from Immortal --> Diety is ~3x the relative gains the AI got from Emperor to Immortal... so I don't think I'll be trying that any time soon).
You're totally new to Civ 5, you've played a total of 6 games, won them all, and are ready to tackle immortal for game 7? Winning settler through prince, I could see, sure... but beating King and Emperor on the first try with practically no game experience at all, and NO experience on higher difficulties? Not believing it, sorry. There's a lot more you need to learn about how to play and win at this game than you can learn in a tiny handful of settler to prince games, before you're cleaning up in King and Emperor. If you truly did that, and they weren't cherry-picked wins with all easy settings and maps, then you sir, are a quite mighty game god indeed.
Don't judge based on your personal experience. I was monarch-emperor(barely) Civ4 player. When Civ 5 was released, I played one game on king, which was incredibly boring. My next game was on emperor several month later after the big 'June patch', that supposedly made the game harder. Same effect. The next one was immortal and a month or so later I won my first deity game. I'm not telling that to brag. In fact, I'm not that good of a player. My point is the opposite: Civ 5 is easy. And there is no reason for fast learner not to fly through difficulties if s/he is willing to pay attention and actually learn. And adwcta's other posts suggest he's taking this Civ business very seriously.You're totally new to Civ 5, you've played a total of 6 games, won them all, and are ready to tackle immortal for game 7? Winning settler through prince, I could see, sure... but beating King and Emperor on the first try with practically no game experience at all, and NO experience on higher difficulties? Not believing it, sorry. There's a lot more you need to learn about how to play and win at this game than you can learn in a tiny handful of settler to prince games, before you're cleaning up in King and Emperor. If you truly did that, and they weren't cherry-picked wins with all easy settings and maps, then you sir, are a quite mighty game god indeed.