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Soldering surface mount transistors (SMT's) can be a tricky thing. Too big of a soldering tip will make the job a nightmare if you happen to solder some pins together.
So if you're going to start, get a magnifying glass (unless your eyes are good) and a pencil point soldering tip. Have some desoldering wick also, in case you make mistakes. You'll also want to get some flux as well, to make soldering easier.
Finally, you'll need to get some electricial contact cleaner to remove excess flux. Or you could use denatured alcohol--it will leave a little residue, but you can brush that away.
Surface mount repairs can cost, since extra care, equipment and time is needed to perform installations. But if you've soldered before, the rules are the same except the fact that you cannot hold the chip under heat for long and the amount of solder needed to solder an SMT is probably 1/4 of what you would use for a normal component. Other than that, you should be fine.
If you're still not comfortable, practice soldering before you begin.
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