The way I see it is, put them anywhere people are going to see it. Dont worry about them getting torn down. I've got stickers I put up 6 months ago still in place, yet I've also had stickers torn off within 15 minutes of me putting them up. If they get torn down, put a new one up. I find it a buzz when I overhear people talking about the shit I've put up, be it good or bad. The only other person who knows where they come from is my girlfriend, so to hear people yapping on about my stuff is awesome.
Just go out, take about 30 stickers with you, and go fucking nuts. Put them anywhere they'll stick. Just DONT GET CAUGHT.