If you find yourself dealt a pair of Aces preflop, congratulations you are now holding the top hand in NLH. Whether you will finish the hand with a maximum profit or end up losing a big piece or all of your stack, all depends on how you bet and raise preflop. No matter how tempted you are, it would be a bad decision to try and slow play your aces. If you are up against multiple opponents post flop your aces are far from invincible. Pocket aces are top cards to hold but they are only one pair, and you can find yourself being outdrawn on the flop.
Limping in from early position or calling from middle or late position will only land you in trouble if the flop comes down coordinated. If you choose the easier option of just shoving all-in preflop, chances are you will take down the pot there and then, but you want to be able to get as much profit as possible from this premium hand.If you are in an early position holding pocket aces you should make a decent size raise. A raise from an early position should stop too many callers, but you will be called by players holding hands like top pairs like K-K and Q-Q, hands like A-H and A-Q are not so likely as you are holding two of the aces. If you are up against the large stack or a loose-aggressive player, the range of hands that you may be called with will be larger. Holding aces, you want players to call you and to definately reraise you, then you can reraise all-in and drive out any lesser hands that may have been a danger to you on a coordinated flop.
If you are in middle to late position, always reraise any raiser and their callers. Reraise all-in if the original raise was on the large side, or there were two or more callers. This will drive players out of the hand as well as build a large pot. After the flop you should always be aware that you could possibly be outdrawn and you could lose your stack, but the more players you can drive out of the hand the better chance you have of winning the pot.
If you are not all-in after the flop, now you can outplay your opponent, but if the flop comes down coordinated and you think your opponent has hit his draw, make the decision to lay down the hand. Being able to make a big laydown when your aces look beat will mean the differance between staying in the game or busting out.