I had AA just an hour ago and lost to 42s.
Raised preflop by 5BB, flop came X42. I assumed he had to of missed and raised all-in. I get snap called and they show two pair. I leave the tourney two places short of cashing.
As long as you keep your emotions in check you'll be able to maintain perspective and you'll be fine. It's when you let negative feelings influence your perception and actions that things start to get messy and you can do some serious damage to your wallet and discipline.
Patience and limiting losses are the 2 keys. Yes obviously AA is a strong hand but once the flop hits, your opponent could have anything. Regardless of position, with this particular holding, don't just shove. Bet and see where you stand.
The only time you get called by shoving all in, in this scenario, is if youre beat. So instead of putting your stack totally at risk, just make a good solid bet.
Just because you might be a tight player and would never call a raise with 42, doesn't mean many others wont.
Try to never put your entire stack at risk, unless you cant avoid it, like you've got 20 BB or less late in a tourney or if you have the nuts. If youre going to put your stack on the line, make sure, to the best of your ability, that you've got the guy smashed. Having AA on any flop, before you've seen any post flop betting, etc, you really have little idea what the other guy could have. Also know the player your in the hand with and their tendencies. That's maybe the most important thing to learn. Holdings don't matter... players and their tendencies matter.