To be fair, St. Mirren didn't defend at all in that game, they were a shambles at the back, barely a challenge for any of the goals scored. Push McDonald out wide as often as possible, and make sure someone gives Samaras a couple of hefty dunts early on (he's a total shitebag, lets face it) and we *might* keep them from scoring.
Oh aye and put McGeady on his arse a few times as well, just for fun.