you really have to choose your spots. it helps, if its a mtt, if you've been at the same table for a good while. even if you haven't gotten anything worth clicking and taking notes on opponents, you should be concentrating on how these people react to certain things. i don't always consider a blind steal to just be when all hands have been folded to me in late position, i always think of it as a way to backhand limpers i've got enough of a read on (limping any suited, any suited with face card, any ace, any suited ace, any hand that could result in a royal flush (T3o for example) or A high straight, any hand that could result in any straight (37o), small pocket pairs), whatever the case may be, and they're pretty passive like "ooooh man, why did someone raise, i really wanted to play this hand but now i must fold"...and i'm sure you're playing pretty small stakes so i think this is relevant. pay attention to what people are playing, even if you've got 7 other games going and you have to click back just to check. you're really trying to find the passive ones...but the reason you want to check is some people don't know how to do anything other than limp and call, even if they're holding AA/KK. that's noteworthy.
the reason i bring all this crap up is in micros, until the blinds are ultra mega chicken high, its limp city, or at least there's always one who's having the luckfest of his life, always limping in, and if he's the only one aside from the blinds, you need to know whether you can make him fold. you also have to keep track of the "big blind warrior" who will protect it to any kinda raise most of the way through a tourney...he takes it personal. doesn't mean he'll re-raise, but he'll call, and call, and call...if that's your target, you need a different approach.
all that said, i'm not that much into abusing blind stealing, not in the cheap-stakes. sometimes its just best, that if its one of those games, to wait to steal when its just all-in or fold time....and sometimes a table is so fishy, you just have to realize that's your best chance to start dominating the table. have to pay attention to people's calling ranges, donkfullness, whatever that you can exploit or that will cause you to adjust. seems sometimes in a mtt, you get the hang of a table, nothing to worry about, know what you can get away with, then all of a sudden, you get moved into a table of chaos, but hey, take notes, you'll see them again
*edit* and i'll edit this...i think you'll find you'll end up making more chips show up in your stack by playing the better hands and just choosing some hands postflop to raise and re-raise, you don't need as much of a read once you're pretty sure your hand is better...you're either doubling up, going home, or taking the stack of some guy who's chasing a 3-outer (well, if you're going home, he had you the whole time or the river flooded, oh well)