Put a small amount of solder paste on the pads for that part. I use zinc chloride I believe. Lay the part on the pads and tap each pad with the iron. It should set very quickly, less than a second per pad. Use a good iron, get one where you can set the temperature, bring up to 500 oF. You shouldn't need to use any solder as the pads probably have enough, if not just wet the tip lightly. SMT stuff is really easy to work with and if you just lay the part on there and apply the heat you'll see it drift to where it's supposed to go.
If you haven't done this before I highly recommend practicing on a junk board. Just pull off some of the smt parts with a pair of pliers and resolder them back on. You'll get the hang of it very quickly. If you don't have an iron, get one that lets you set the temperature, if you go the cheap route, get the hottest fixed temp iron you can find. 40 watt is a good choice. a 15 or 20 will leave you in frustration.
