AK is so confusing

For me, AK is a very difficult hand to play. I have always have been put in a situtiation where I have to go all - in with AK. I usually make my decisions from the read I make from the players. I usually end up folding, because I dont want to miss. Here is one of the situation i had to face yesterday.

Tournament #11410377, Hold'em No Limit - Level III
(25/50) - 2005/08/17 - 09:09:21 (ET)
Table '11410377 1' Seat #8 is the button
Seat 1: skullion (2485 in chips)
Seat 2: rmrafuse (2865 in chips)
Seat 3: newts (1595 in chips)
Seat 5: OSUBucks42 (1400 in chips)
Seat 6: valjoli (995 in chips)
Seat 7: Masterhp (1425 in chips)
Seat 8: USMCBugler (2150 in chips)
Seat 9: Pullfinger (2620 in chips)
Pullfinger: posts small blind 25
skullion: posts big blind 50
*** HOLE CARDS ***
Dealt to Masterhp [As Ks]
rmrafuse: calls 50
newts: folds
OSUBucks42: folds
valjoli: calls 50
Masterhp: 250
USMCBugler: raises 250 to all-in
Pullfinger: folds
skullion: calls 65
rmrafuse: calls 65
valjoli: folds
Masterhp: ???

Another thing, i know i am suppose to play AK very aggresive. I usually do preflop, but what do i do when i miss? Do I still play aggressive and try to get the pot. Or should i fold vs a big bet, and keep my fingers crossed and call a small bet? Please, any opinions at all on how to play AK perfectly, would be greatly appreciated.