I have played quite a number of $1 and $2; 9 person SnG's. Stealing is how I make the majority of my stack. Here how I do it: in the lower levels you need to observe the person on your right and the two people on your left. Are they tight? Do you they fold in the S/B? Observe what type of hands they show down. Play tight. The only cards you should be playing are premium and suited aces (assuming the pot is unraised, if raised fold). You should also be raising and not calling.
During the middle stages of the tournament you should have a very tight, solid table image. Still play only the premiums. You will have showed down one or two hands so the table knows you only play big cards. Which sets you up for bubble play....
Bubble play/late stages, the most important thing to remember is if someone has already opened the pot, you should not be trying to steal. Only steal when you are in late position (on the button or cut-off) and nobody else has entered the pot. When I steal, I typically have any ace, King with a reasonable kicker (8 or better), any suited connectors, any pocket pairs. Typicially I raise 3xBB. If you get called, all is not lost, you at least have a half reasonable hand to play after the flop. If you get re-raised all in, you can laydown your hand without sustaining too much damage.
One other method of stealing is if you are in the big blind and everyone fold to the small blind...and the small blind checks. At this point you should have have a pretty good idea how how the small blind plays. If they are continually limping into the pot, they are about to become a victim. If the table folds to the small blind and they just check...If I have any ace, any king, any suited cards, any pocket pair, any connectors, I'm gonna push all in. They will freeze for a second cuz they just crapped in their pants, then they will fold.
Re-steal: This move requires balls of steel. If you KNOW someone is putting on a move...shove your stack all in. You really have to know the person to determine if they are stealing or if they have a hand. Also if you have premium cards, don't call, shove it all in.
Stealing comes down to courage and how well do you know your victims. It's touch to hit the raise button when you don't have great cards. It took awhile to get the hang of it. This is a major hurdle to clear but absolutely necessary.
Good luck.