The button is when you are marked as the dealer , and the best position to be in. All bets go around the table and then you can decide what to do from there. It's easier to get more money in that position b/c it goes around letting all the players chip in the small bets before it comes to you. (if no one raised or went all in.) All in pre-flop is always dangerous no matter what two cards you have. There's better hands (suited paint aka Face Cards , pocket pairs over 9) but it's always a gamble....
Pocket pairs heads up are usually a good hand , and will win quite a bit heads up. But anything 9's and below are iffy. Remember if you have pocket pairs it increases the odds
of someone else having pocket pairs.
I saw a little tidbit during one of the TV shown tourneys that adds to the point... If you have pocket kings the odds are 44:1 that someone on the table has Pocket Aces.... While not the best percentage , it's still enough to make you think. (Though pocket K's will usually win in an all-in battle , less they've got those Aces.)
If someone goes all in pre-flop against me , and they've not shown any signs of bluffs... I'll only call with a pair 10's-A's , or KJ suited & up'. K-10 or Q-J , even suited don't hold enough pull in the long run.
And just remember you will watch hands go by! Don't kick yourself in the arse just because you passed one up. Play smart , and don't let that put you on a Tilt.